Color Shade Research Articles

Sustainable fashion: eco-friendly dyeing of wool fiber with novel mixtures of biodegradable natural dyes

Natural materials, especially natural colorants, have achieved global prominence and might be regarded as an environmentally beneficial alternative to hazardous synthetic dyes. The color limitation of natural dyes hinders their application in textiles. The present work aims to prepare more color shades of wool yarns via dyeing with ternary natural dye mixtures without adding mordants. In this study, a sustainable dyeing approach for wool yarn was evaluated with three natural dyes, madder red (MR), gardenia blue (GB), and gardenia yellow (GY), by following an industrial dyeing procedure in the absence of a mordant. In the beginning, a preliminary assessment of dye stabilities was carried out, and it was found that the three natural dyes were sensitive to temperature and acid (degradation tendency). Then, the dyeing behavior was systematically evaluated, including a single natural dye, a binary natural dye mixture, and a ternary natural dye mixture. The results of wool yarn dyeing with a single natural dye show that the dye exhaustion percentage (E%) of MR, GY, and GB was in the ranges of 78.7–94.1%, 13.4–44.1%, and 54.8–68.5%, respectively. The dyeing results of wool yarns dyed with binary and ternary natural dye mixtures (a color triangle framework of dyed wool yarn) were characterized by colorimetric values (L*, a*, b*, C*, h, and K/S), and are presented to enlighten various colorful shades. Finally, color uniformity and colorfastness tests confirmed the vital contribution of natural dyes toward wool yarn coloration. Particularly, colorfastness to washing confirmed the stability of natural dyes with reference to the lower amount of dyes released into the effluent, which is beneficial for the environment. Overall, this study provides a good background for enhancing the industrialization trend of natural dyes by modulating their dyeing scheme.

A Novel Metaphor Graph Drawing Method for Multidimensional Data Visualisation and Its Case Study on COVID-19 Vaccination Analysis

Visualisation techniques have been one of the best data processing and analysis methods in recent decades, and they have assisted in data understanding efforts in various fields. Visualisation techniques for low-dimensional data are well developed and applied in multiple sectors; however, multidimensional data visualisation techniques still present some limitations, such as inaccurate data comparison and perception, exaggerated visual differences, label occlusion, and overlap. This study addresses the pros and cons and proposes a novel graphical drawing method, the multidimensional rose chart. It adopts the design idea of the Nightingale rose chart, but overcomes relevant limitations. The main challenges of this area include the incomplete presentation of multidimensional data, the neglect of the linkage of multiple attributes, the inefficient use of space, and the lack of simplicity of the interface. Contributions include enriching the representations of multidimensional data through the use of colour shades, area, and height sizes to represent values; straightforward data attribute comparisons via graph nesting; and detailed attributes showing the use of specific value labels. To verify the preliminary validity of this method, we imported COVID-19 data into experiments and further compared the final layouts with traditional methods, such as the line chart, bar chart, tree, parallel coordinate chart, and Nightingale rose chart, as well as their structures, functionalities, clear advantages, and disadvantages. The experimental results show that multidimensional rose diagrams perform effectively in presenting multidimensional data when comparing other graph drawing methods in our case, and the outcomes match existing works' conclusions in related COVID-19 research sectors. This work has the potential to provide a suitable supplemental approach to the multidimensional data analysis.

Enzyme-Linked Aptamer Kits for Rapid, Visual, and Sensitive Determination of Lactoferrin in Dairy Products.

Lactoferrin (Lf), as a popular nutritional fortification in dairy products, has the ability regulate the body's immune system and function as a broad-spectrum antibacterial, which is of great significance to the growth and development of infants and children. Herein, an indirect competitive enzyme-linked aptamer assay (ELAA) kit was established for rapid, sensitive, and visual determination of Lf in dairy products. In the construction, the Lf aptamer was conjugated with horseradish peroxidase (HRP) as the recognition probe and aptamer complementary strand (cDNA) were anchored onto the microplate as the capture probe. The recognition probes were first mixed with a sample solution and specifically bound with the contained Lf, then added into the microplate in which the free recognition probes in the mixture were captured by the capture probe. After washing, the remaining complex of cDNA/Aptamer/HRP in the microplate was conducted with a chromogenic reaction through HRP, efficiently catalyzing the substrate 3, 3', 5, 5'-tetramethylbenzidine (TMB), therefore the color shade would directly reflect Lf concentration. Under the optimization conditions, a good linear relationship (R2, 0.9901) was obtained in the wide range of 25-500 nM with the detection limit of 14.01 nM and a good specificity, as well as the reliable recoveries. Furthermore, the ELAA kits achieved the Lf determination with an accuracy of 79.71~116.99% in eleven samples, which consisted of three kinds of dairy products: including goat milk powder, cow milk powder, and nutrition drop. Moreover, the results were also validated by the high-performance capillary electrophoresis (HPCE) method. The ELAA kit provides a simple and convenient determination for Lf in dairy products, and it is highly expected to be commercialized.

The effect of different mordants on natural dyeing of cotton, viscose and lyocell fabrics with pomegranate bark extracts

Considering the growing environmental awareness, natural dyeing is considered as a sustainable approach in textile dyeing, which can minimize the environmental impacts of synthetic dyes. In this study, it was aimed to compare the dyeing properties of different cellulose-based fabrics (100% cotton, 100 % viscose, 100% Tencel) with pomegranate bark extract as a natural dye by using two different mordants (potassium aluminium sulfate and iron (II) sulfate). Results revealed that potassium aluminium sulfate (alum) and iron (II) sulfate gave different color shades from light to medium yellowish-brown shades with different color depth (K/S) and color vividness (chroma). Alum mordant resulted in lighter, more greenish and more yellowish shades with more vivid color than iron (II) sulfate. The maximum K/S of 3.5 was achieved with viscose fabric mordanted with iron (II) sulfate. All dyed samples had satisfied color fastness values and increased tensile and tear strength compared to raw fabrics.

A Comprehensive Study of N-Butyl-1H-Benzimidazole.

Imidazole derivatives have found wide application in organic and medicinal chemistry. In particular, benzimidazoles have proven biological activity as antiviral, antimicrobial, and antitumor agents. In this work, we experimentally and theoretically investigated N-Butyl-1H-benzimidazole. It has been shown that the presence of a butyl substituent in the N position does not significantly affect the conjugation and structural organization of benzimidazole. The optimized molecular parameters were performed by the DFT/B3LYP method with 6-311++G(d,p) basis set. This level of theory shows excellent concurrence with the experimental data. The non-covalent interactions that existed within our compound N-Butyl-1H-benzimidazole were also analyzed by the AIM, RDG, ELF, and LOL topological methods. The color shades of the ELF and LOL maps confirm the presence of bonding and non-bonding electrons in N-Butyl-1H-benzimidazole. From DFT calculations, various methods such as molecular electrostatic potential (MEP), Fukui functions, Mulliken atomic charges, and frontier molecular orbital (HOMO-LUMO) were characterized. Furthermore, UV-Vis absorption and natural bond orbital (NBO) analysis were calculated. It is shown that the experimental and theoretical spectra of N-Butyl-1H-benzimidazole have a peak at 248 nm; in addition, the experimental spectrum has a peak near 295 nm. The NBO method shows that the delocalization of the aσ-electron from σ (C1-C2) is distributed into antibonding σ* (C1-C6), σ* (C1-N26), and σ* (C6-H11), which leads to stabilization energies of 4.63, 0.86, and 2.42 KJ/mol, respectively. Spectroscopic investigations of N-Butyl-1H-benzimidazole were carried out experimentally and theoretically to find FTIR vibrational spectra.

Penerapan Elemen Menara Pada Bangunan Bergaya Art Deco Di Medan

The characteristics of a building style and its character are shaped by some of its architectural elements. One of these architectural styles is an Art Deco-style building that has its own character. This style first appeared in 1925 and developed until 1940. This European architectural style was adopted in various American buildings due to their condition in the time of the industrial revolution. The modern architectural movement that developed at that time also influenced the art deco style and gave it a modern touch. The Art Deco style in graphic design restores again decorativism but not necessarily in the form of ornaments. Decorative impressions can be achieved through the play of elements geometric, typographic blocks, textures and shades of color. Art Deco style has characteristics that are very distinctive and easily distinguished from other architectural styles. Art deco still exists in the spirit of medan city development as place of research evidenced by the many old buildings that are repurposed as well as new buildings that take the characteristics of Art Deco. One of them is the use of tower elements or one part of the building that rises slightly upwards and gives a magnificent impression.

ASSESSMENT AND MAPPING OF THE DIVERSITY OF COLOR SHADES OF LANDSCAPES IN SUMMER SEASON USING SATELLITE IMAGES

The landscape, bearing certain pressure from the society, simultaneously has an aesthetic potential and actively affects the emotional and psychological comfort of a person. Among the many factors affecting the aesthetic qualities of the landscape (relief, vegetation, water, etc.), colour is also separated. The color diversity of the landscapes is impossible to appreciate with only using eyes. The article presents a unique methodology for separating colour shades, which are one of the important aesthetic factors of the landscape. For the first time, an attempt was made to distinguish the color tones that have a great influence on the aesthetic qualities of landscapes and to group them by analyzing the spectral curves of satellite images․ In contrast to the traditional field method, satellite images allow us to assess color tones over a short period of time and over a large area. Red, green and blue are considered the main physiological colours, and almost all true colours can be obtained by the combination of these three radiations. An attempt was made to separate the colors in the landscapes by analyzing spectral curves in green (543–578 nm), red (650–680 nm), blue (458–523 nm) spectral ranges of the Sentinel-2A, Sentinel 2B TCI (true color image) space images taken in the summer with a resolution of 10 m. In a professional software environment, 50 classes were obtained using "unsupervised" classification method, and for each class, the curves with the average values of spectral reflection of three visible colour ranges were obtained. By grouping the classes, a map of five colour groups (blue-green, green, red, gray and yellow, white) of the landscapes of Syunik Region was created for the summer season. Since the most important factor of colour harmony is the balance of colour shades, an attempt was made to determine the colour diversity of landscapes. Based on the obtained colour groups, in the summer season the colour diversity of the landscapes of Syunik Region was asssessed and mapped using Shannon's coefficient of heterogeneity. As a result, it was found that 52% of the landscapes of Syunik Region have green colouring in summer. The latter is considered a positive feature of the aesthetic appeal of landscapes and has a calming effect on a person. White colour has the smallest percentage share. 36% of the territory of the region has a high and very high diversity indicator, and 17.6% has a very low degree of diversity. In summer, the North-Eastern part of the region, the areas adjacent to the lower and middle streams of the Vorotan River, the Voghji and Meghri River basins are distinguished by colour diversity. However, from the point of view of aesthetic perception, the average degree of diversity is highly assessed, which is 27.2% in Syunik Region. The Southern part of Syunik has an average degree of diversity, especially the valley areas of the Araks River, the area of the Spandaryan reservoir.

Antimicrobial dyeing of cotton from Euclea racemosa root

PurposeThe purpose of this research is to develop an environmentally friendly antimicrobial dyeing of cotton fabric from the root of Euclea racemosa. Textile phytochemical finishing is in high demand worldwide because of its low toxicity, low pollution, ease of availability, renewability, pharmacological effects and non-carcinogenic properties, as well as its multifunctionality, rapid process stages and potential health benefit.Design/methodology/approachThe cotton fabric was dyed with aqueous extracts of Euclea racemosa root dyes. Dyes were extracted for 20 min at pH 7.43 at room and boiling temperatures with material-to-liquor ratios (MLRs) of 1:5, 1:10, 1:15 and 1:20, altering one variable at a time, and the cotton fabric was colored using a post-mordanting procedure at 50°C with an MLR of 1:20. Using a properly cleaned Petri plate, the colored samples were tested in vitro for antibacterial activity. A spectrophotometer was used to assess color strength and shade depth, as well as wash fastness and annual rubbing fastness tests for both wet and dry.FindingsL* = 36.29, a* = 58.56, b* = 32.46 and K/S = 0.51 were the CIELAB values for dye extracted at boiling temperature. L* = 47.14, a* = 42.23, b* = 49.61 and K/S = 0.38 were the CIELAB values for dye extracted at room temperature. The wash and rubbing fastness of the dyed samples were outstanding and the dyed cotton fabrics were found antibacterial against Gram-negative bacteria Escherichia coli.Originality/valueDyes derived from the E. racemosa root could be used to develop a new antibacterial cotton fabric dye.

Environmental friendly silk and cotton dyeing using natural colorant of Bougainvillea (Bougainvillea glabra) flowers: the sustainable approach towards textile industry.

For the current study, Bougainvillea flowers as environment friendly sustainable source of plant-based natural dye have been selected as an alternative to toxic synthetic dyes for dyeing of cotton and silk. Natural colorant from Bougainvillea flowers (Bougainvillea glabra) was extracted using aqueous and acidic extraction media. Maximum colorant was extracted in aqueous medium, and further it was used for cotton and silk dyeing. The optimum values of the dyeing parameters including dyeing time, dye to liquor ratio and salt level as exhausting agent were found to be 30min, 35-mL liquor ratio and 3.0g for cotton and for silk 45min dyeing time, 45-mL liquor ratio and 3.0g exhausting agent in aqueous dye extract. Bio mordanting has been applied to attain a variety of color shades. The utilization of 3% of henna, 4% of turmeric for silk pre-mordanting and for post-mordantingturmeric at 3% and henna at 4% for silk gave a darker shade. Forcotton bio mordanting, 2% turmeric rhizome powder, 3% henna leaves powder extract as pre-mordant and 2% turmeric, 3% henna as post-mordant hasdeveloped a variety of shade. Overall, it has been found that natural colorant from Bougainvillea flowers is the new dye source for bio-colorationof natural fabrics, and addition of bio mordants has made the process more calming and eco-friendly.

Digital Image Analysis Using Deep Learning Convolutional Neural Networks for Color Matching of Knitted Cotton Fabric

ABSTRACT The customers make use of Pantone color cards as quality control for their reference to know the color consistency of the dyed cloth. The three different color shades like blue, red and pastel violet were selected from the pantone color shades. The three-color hues of the manufactured knitted cotton fabric were captured by the high-resolution optical device and these images were considered for the training and test purpose. A simple backpropagation based artificial neural network and a deep learning convolution network was considered for the training and test purpose. The pantone color hues of three images were offered to the network as training samples. A backpropagation algorithm trained artificial neural network (ANN) and deep learning neural network trained with support vector machine were employed in training phase. The back propagation trained ANN predicted 82.37%, 83.16% and 89.25% correct classification on three color hues. A deep learning convolution network trained with support vector machine method forecasted 100%, 100% and 100% on three color hues. The better performance result was secured by the second method. The second network reduces the features from the color images in training and test phase.

Microwave-ultrasound assisted extraction of red corn pigments and their effect on chemical composition and tecno-functional properties

Currently, there is a growing interest in obtaining natural pigments, without presenting a risk to health, as well as to the matrix and food safety. The objective of this study was to characterize grains with different shades of red color (High pigmentation maize = RA, Medium pigmentation maize = RM, and Low pigmentation maize = RB, reddish maize with white segments = VO and white maize control = SC). The physical properties (kernel weight, length, width, thickness, and grain and flour color), chemical composition (moisture, fat, protein, fiber, starch, ash, and minerals), and techno-functional properties (capacity of absorption of organic molecules (OMAC), swelling (CH), oil retention (CAAC), and water absorption (WAS)) variables were measured. Afterward, RM was selected, and a pigment extraction (EAUM) was carried out using microwave-ultrasound equipment with different ratios of ethanol (0, 30, and 70%) and citric acid ratios (0 and 1%). The color and properties of the solid (starch, protein, fat, and their techno-functional properties) were determined in the aqueous phase and were compared with the properties prior to EAUM. The results indicated that the red grains have higher starch content (57.6%) and reddish colors, in addition, VO presented higher moisture (10.4%), fat (6.7%) and fiber (10.0%). The colors of the pigments obtained with EtOH (30 and 70%) show shades red and yellow. Finally, the EAUM decreased the fat content up to 57%, increased WAS and CAAC in the residual flour and generated changes in OMAC and CH, increasing in aqueous medium and reducing with EtOH.

Mineralogy of interior jewellery ammonites of the Samara region

Background. Ammonite products are increasingly gaining in popularity. Ammonites are characterised by a variety of colour shades, shapes and sizes, making them suitable for manufacturing a wide range of souvenir and jewellery products. Russia enjoys significant resources of ammonites of interior and jewellery-ornamental quality; however, these materials remain insufficiently studied from the mineralogical point of view. This article presents the mineral composition and gemological characteristics of the Upper Jurassic interior jewellery ammonites of the Samara region for the first time.Aim. To describe the stratigraphic position and mineral composition of interior jewellery ammonites of the Samara region.Materials and methods. Late Jurassic ammonites (45 samples) were collected from a number of their main locations. The characteristic types of ammonites of interior-jewellery quality were distinguished and studied. Experiments included the determination of microhardness (25 determinations), density (12 determinations), luminescence features (10 samples), optical and petrographic analysis (5 thin sections), as well as the quantitative determination of mineral and chemical composition (3 samples), and electron probe studies (2 samples).Results. Ammonites are characterized by the presence of a mother-of-pearl layer with multi-coloured iridescence. The ammonites under study consist mainly of apatite (21—70 wt. %) and calcite (21—87 wt. %) along with quartz, aluminosilicates, gypsum, pyrite, zeolites, goethite, ilmenite and organic matter. The chambers of ammonite shells are made of phosphorite and calcite. The walls and partitions of shells have completely lost their original aragonite composition and consist of apatite and calcite with pyrite inclusions. The increased content of Sr (up to 0.17 wt. %) and Ba (up to 0.01 wt. %) are recorded as trace elements in ammonites. Calcite contains the following trace elements (wt. %): Mg — 0.17, Mn — 0.17, Fe — 1.14, Sr — 0.11, and Y — 0.17.Conclusion. The mineral and chemical (including microinclusions and trace elements) composition of interior-jewellery ammonites was established for the first time. The ammonites of the Samara region are of commercial interest as interior samples. Their shell fragments can be used in jewellery production. The ammonites under study can be collected along the coastal cliffs and beach area of the Volga river, thereby requiring no capital investments and producing no environmental pollution.

Never stop wondering: When cells become PAP-art on the slides.

The project named Victoria's cells was created to train health care personnel, especially in low-income countries. This innovative approach is designed to associate benign and malignant cellular images and/or patterns with a range of shapes and color shades to evoke animals, common objects, and colorful aquariums. The project makes use of familiar images to capture the viewer's interest as an aid for cytological interpretation. Cervicovaginal cytology is processed with conventional and liquid-based cytology. The images are visually compelling to highlight the importance of studying cells and their diagnostic significance. Infectious diseases as well as malignant cells are thereby easily recognized. The pictures are organized into different sections, including Victoria's zoo, Victoria's fantasy, and malignant mockery. Branching mycelia resemble a starfish; squamous metaplasia recalls a sea turtle's shell. Among others, different patterns of endometrial, endocervical, and squamous cells can resemble fish tanks populated by cells with the shapes of pufferfish, anglerfish, whales, scorpions, and garfish. The sea transitions to the earth, with a sly cat, a little elephant, a dog, and a koala. Other cellular preparations resemble a gymnast, a geisha, and a plunging diver as well as hummingbirds, a heron, a water lily, and a peony. The malignant mockery section is composed of squamous intraepithelial lesion patterns that resemble monsters, eyes, a foul tongue, eagles, and feathers. In conclusion, the recognition of visual images can make the study of cytology simpler and more enjoyable and serve the final objectives of prevention and cure.

Wood discoloration patterns depending on the light source

The wood photodegradation, including discolouration caused by exposure to UV and solar radiation, has been intensively studied, while the effect of artificial lighting on wood has been little investigated. In the present study, the effect of three types of artificial light sources (LED, incandescent, and fluorescent lamps) on the colour changes of wood was evaluated. LEDs with high (6500 K) and low (3000 K) correlated colour temperature were employed in the experiments. Wood colour was assessed by spectrophotometric measurements of reflectance spectra, which were converted into colour parameters of the CIELAB colour system. The total discolouration as well as the changes in colour lightness, chroma (saturation), and hue were evaluated for two hardwood species (birch, oak) and two softwood species (spruce, pine - sapwood and heartwood) depending on the irradiation dose. Visually perceivable changes in colour of all woods were observed already at relatively low irradiation doses, indicating a high sensitivity of the wood to radiation emitted by artificial light sources. Comparing the softwoods and hardwoods included in the study, the latter proved to be more resistant to discolouration caused by the tested light sources. Overall, greater colour changes in long-term exposure were caused by incandescent and fluorescent lamps, although more rapid discolouration developed in the early stage irradiation with LEDs. A substantial difference between the effect of the tested LEDs was only observed in the initial phase, when the cool LED (6500 K) caused more discolouration. The changes in the colour parameters were complex and varying in directions, including a reversal with the accumulation of the irradiation dose, indicating that the exposure to artificial light sources resulted in continuous alteration in the shade of the wood colour.

​On-farm Evaluation of Leaf Colour Chart and Chlorophyll Meter for Need-based Nitrogen Management in Kharif Maize (Zea mays L.)

Background: Soil is important medium of all living beings. Due to the high doses of fertilizers application soil heath is getting deteriorated. Soil fertility variation restricts efficient fertilizer N management when broad based blanket recommendations are used in maize (Zea mays L.). Site-specific fertilizer nitrogen management (SSNM) could be the best management option to avoid excessive and untimely nitrogen (N) applications in maize. Methods: A field experiment was conducted at agronomy Farm, Lovely Professional University, Phagwara during kharif season of 2020 and 2021 to study the nitrogen management using leaf colour chart (LCC) and chlorophyll meter in maize (Zea mays L.). Colour (of the first top maize leaf with fully exposed collar) as measured by comparison with different shades of green colour on a leaf colour chart (LCC) and also by SPAD meter. Need based fertilizer application at LCC5 and SPAD 50 significantly improved growth and yield attributes viz., plant height, dry matter accumulation plant-1, number of leaves plant-1, stem diameter, number of internodes plant-1, leaf area index, cob length, cob girth, number of cobs plant-1, number of grains cob-1, grain weight plant-1 and 1000-grain weight along with higher grain and stover yields, grain protein content over fixed time application of 1200 kg N ha-1. Result: Evaluation of the established threshold leaf greenness revealed that fertilizer N management using LCC 5 and SPAD 50 starting from six-leaf stage to before silking stage resulted in improved agronomic efficiency in maize. There was no response to fertilizer N application at silking stage. The study concluded that in maize, fertilizer N can be more efficiently managed by applying fertilizer N dose based on leaf colour as measured by LCC than blanket recommendation.

Screening for Color Vision Deficiency in Health Science Students

Purpose: Various professions require employees to be able to detect different shades of color accurately when visually reading test results with colorimetric end points. To prepare health science students to better meet this requirement, a screening test for color vision deficiency (CVD) was administered to detect any major or minor errors as part of the undergraduate student experience. Method: Screening for color vision deficiency was administered using the Farnsworth D-15 Color Vision Test. Students completed the test and their results were scored and interpreted at the time of completion. Results: Students (n=85) from nine different health science programs completed the Farnsworth D-15 Color Vision Test. Ages of the participants ranged from 18-63 years with 70% of the participants in the age range of 18-23 years. Seventy-one percent of the participants identified as female, 28% identified as males, and 1% identified as non-binary. Two students (one female and one male) had a minor error resulting in a crossover within the test circle on the Gulden test score sheet. There were no major errors identified in the 85 participants. Conclusion: While two minor errors were detected in this population, this data is not consistent with other CVD studies. This most likely is due to screening predominately female students, and/or the amount of time allotted for each individual test to be completed. Future studies will include expanding the participant numbers, with a focus on testing more male participants, limiting the number of minutes to complete the screening process, and collecting additional demographic data.

Biophysical aspects of electromagnetic theory of human vision perception of light information in the visible range

Objective. To propose an electromagnetic model for human recognition of light information received by a man in the visible range of light, which allows to prove its consistency strictly and based on the calculations made, as well as models of electronic circuits illustrating how simple connections between rods and cones can ensure its implementation, and construct a hypothesis about the transmission of converted information in real-time to the central nervous system on their basis. The goal also includes proposing a hypothesis for the volumetric perception of external information by the visual analyzer and the central nervous system.Materials and methods. Mathematical modeling of data approximation in biology and medicine of numerical values of parameters according to experimental data, a set of formulas and equations that describe the properties of the object under study and allow establishing quantitative relationships between them.Results. The model developed by the authors of electromagnetic perception of electromagnetic waves of the visible spectrum by human vision based on their resonant separation and amplification allows us to propose a solution to the theory of color vision. The given speed calculations based on the saltatory conduction of information from the nerve fiber explain the human subjective feeling of light almost instantly. The hypothesis proposed by the authors of a three-dimensional perception of the external world by a person needs an in-depth mathematical justification. Therefore, we can assume that this is another step in solving the problem of human perception of light information.Conclusions. The electromagnetic theory of colour perception by the human visual analyser of light information has been constructed in contrast to the corpuscular. Calculations of the electrophysiological parameters of rhodopsin molecules included in the rods are presented, and, a model of resonant perception of electromagnetic oscillations for the visible range of light by the human eye has been developed on this basis. Calculations based on the developed model for converting information in the visible light range of the electromagnetic spectrum made it possible to more accurately determine the number of colour shades distinguishable by the human eye. A mathematical model describing the transmission of information about the spectrum and intensity of the electromagnetic signal of the visible range of the spectrum transformed by the eyes to the central nervous system has been proposed. The speed of information transmission along the optic nerve has been calculated. The hypothesis for the volumetric perception of external information by the visual analyzer and the central nervous system has been proposed. Practical application of the developed model can be devices allowing to restore vision, as well as devices for correcting vision function built on its basis.

An Overview on Colour Cotton Research – A Review

In the current review of literature study we aimed to describe and delineate on current and future perspectives on colour cotton research. In India, about 40 coloured genotypes of upland cotton (G. hirsutum), mostly of various shades of brown and green colour have been developed. Brown cotton lines are at the forefront and expects that one of its varieties, DDCC-1, was proposed for release in 2021. Furthermore, DMB-225, a medium brown variety was developed in 2013, along with three other varieties. However, DMB-225 was not released commercially on the grounds that it would contaminate white cotton, though its fiber quality was found highly suitable. By not using chemical dyes, as well as reducing the use of pesticides, the naturally colored cottons have become popular for being ecological and environmentally safe. However, The limitations which impede commercial cultivation of coloured cotton itself signalize future thrust area of research viz. (i) development of wide range of colors with different shades, uniformity and stability, (ii) improvement of fiber properties such as length, strength and maturity, (iii) development of high yielding, early maturing varieties and hybrids, (iv) development of coloured cotton varieties and hybrids amenable to mechanical picking, (v) development of male sterility based hybrids in desi and upland coloured cottons, and (vi) development of coloured transgenic cottons..

Comparative Benefits of Tissue Marking by Poster Ink in Histopathology

Background: Tissue margin marking with India ink is important in decision making for surgeons. The present study was conducted to examine the reliability of different shades of locally available poster colours in tissue marking and to evaluate the colour perceptibility microscopically in comparison with similar tissues marked by India ink.
 Methodology: This experimental study was conducted at Department of Pathology, HBS Medical & Dental College & Hospital, Islamabad from 27th February 2021 to 29th April 2021. Sample size was fifty, collected through convenient sampling technique. Five types of formalin fixed tissue specimens were selected for the study so as to evaluate the effectiveness of poster ink marking on different tissue surfaces. From each specimen, four sections were taken from the margins. Three shades of poster colour (black, blue and green) were used to ink three sections while one section from each tissue type was marked with India ink. After complete tissue processing and routine haematoxylin and eosin (H&E) staining, slides were examined microscopically. Scoring was done on a scale 0 to 3 on the basis of visibility.
 Results: The present study showed that poster colours inking of the tissues was quite reliable as compared to India ink. Most consistent results were achieved with black and blue colours as compared to green colour.
 Conclusion: Poster colours are reliable tool for tissue marking when India ink is not available. Their availability in a variety of colours provides them an edge over India ink.
 Key words: Eosin, India ink, Resection Margins

Eco-friendly dual-chromophore functionalized polyvinylamine derivatives for clean and sustainable coloration of cotton fabric

To solve the challenges of dyeing wastewater pollution and the shortage of reactive green dyes with a single structure, the development of recoverable and recyclable green dye for cotton is urgent and crucial. In this work, a series of novel eco-friendly dual-chromophore functionalized polyvinylamine derivatives (GCPDs) were prepared by grafting yellow and blue chromophores onto polyvinylamine. The grafted polyvinylamine was used as pH-sensitive macromolecular colorants for clean and sustainable coloration of cotton fabric. The pH sensitivity, zeta potential, and dissociation behavior of the GCPDs were studied. The results revealed that GCPDs were sensible to pH, with an isoelectric point ranging from 8.5 to 10.0. When the pH of their solution was below 10, they formed aggregates due to strong electrostatic interactions. Compared with ordinary polyampholytes, the aggregation of GCPDs still occurred when the pH value of their solution deviated from the isoelectric point due to the presence of aromatic rings in their structure. The inner part of the cotton yarns colored with GCPDs was fixed with green color, indicating that GCPDs can be uniformly distributed in cotton fabric. Compared with conventional single-structure reactive green dyes, the color shade of the cotton dyed with GCPDs can be controlled by varying the types and molar ratios of the blue and yellow chromophores in their structure. CIELab values showed that a* value of the dyed cotton ranged from −26.065 to −12.548, while b* value shifted from 2.092 to 20.178. The fixation efficiency of the GCPDs on cotton was greater than 97% when a cross-linking agent was used. GCPDs can be recovered from dying residue, with a recovery rate of >98%. The cotton dyed with GCPDs exhibited rubbing and wash fastness grades of 3–4 and 5, respectively. The dyeing properties of recycled GCPDs were identical to those of the original GCPDs. Therefore, this study provides insight into the development of recyclable and reusable dyes for a clean and sustainable coloration of cotton fabric.