Color System Research Articles

Developing a Colorimetrically Balanced, Measurement-Based Petal Colour System for Cultivated Rose (Rosa L. Cultivars) and the Resulting Colour Categories.

There is no practical and at the same time objective colour system available for describing cultivated roses (Rosa L. cultivars). For this reason, a new colour classification system was developed which is colorimetrically balanced and appropriate for algorithmic colour identification; however, it is also suitable for field-work. The system is based on the following colorimetric criteria: (A) Each colour category is characterised by a measured petal colour in the CIE L*a*b* standard as the centroid of the category. (B) The CIEDE2000 colour differences between the adjacent centroid colours are limited (5 < ΔE00 < 7). (C) The maximal colour difference between the measured colours in a category is also limited (to 12.12 ΔE00). (D) A measured petal colour can only be classified into an existing category if the colour difference from the centroid colour of the given category is less than 5.81 ΔE00, otherwise a new category is required. (E) A category is only considered non-redundant if it has at least one measured petal colour that cannot be classified elsewhere. (F) The classification of the petal colours is based on the least colour difference from the centroid colours. As a result, 133 colour categories were required for describing all the 8139 petal colours of the rose cultivars of the Budatétény Rose Garden (Hungary). Each colour category has the following parameters: standardised colour name, the colorimetric parameters of the centroid, grouping, RHS colour chart coding, and reference cultivars, which are described in the article.

Sensory profile and consumer perception of plant-based non-dairy milk jellies

This study focused on the organoleptic characteristics and consumers’ purchasing decision of milk jellies made with lactose-free cow milk and various plant-based non-dairy milk, including almond milk, coconut milk, oat milk and soymilk. All milk alternatives were measured for the CIE color system. The hedonic scale was used to evaluate product liking on appearance, color, taste, flavor, texture, and overall acceptability–still, the scaling test assigned for the purchasing intention. The results showed that milk alternatives' lightness, taste, and flavor preference affected consumers' liking and purchasing decisions for nondairy milk jellies. Preference mapping showed the relevance of the high lightness of milk alternatives and product acceptability. Coconut milk jelly was the most preferred, as did lactose-free milk jelly, while soymilk jelly was the least.

Peach Fuzz: Conceptual Engineering of Color Categories

This article explores the products of conceptual engineering in contemporary media communication and mass culture. The analysis examines the mechanisms and communicative consequences of intentionally creating color categories. The shade known as peach fuzz, selected by the Pantone Institute as the color of the year 2024, is used as a case study. It is shown that in the case of the color of the year, the transmission of the conceptual idea involves two channels simultaneously (visual and verbal), each in two different forms. The author notes that the visual channel is used to ostensively present the shade with specific chromatic characteristics and to develope a complex visual image on this basis. Special attention is paid to the verbal channel, which is utilized in the form of intentionally constructed color designations and supporting stories (conceptual myths). It is concluded that from the perspective of color communication, verbal and visual texts serve fundamentally different functions. The visual representation shows how the viewer should see the color, while the verbal explanation clarifies why this shade is needed. It is demonstrated that the image embedded in the color name sets the desired connotation, which can transform the perception of the shade by adding necessary meanings to it. The verbal story defines a cognitive “point of view” for introducing a new category into an existing color system.

Designing a highly near infrared-reflective black nanoparticles for autonomous driving based on the refractive index and principle

HypothesisThe development of highly NIR reflective black single-shell hollow nanoparticles (BSS-HNPs) can overcome the Light Detection and Ranging (LiDAR) sensor limitations of dark-tone materials. The crystalline phase of TiO2 and the refractive index can be controlled by calcination temperature. The formation of hollow structure and the refractive index is expected to simultaneously increase the light reflection and LiDAR detectability. ExperimentsThe BSS-HNPs are synthesized using the sol–gel method, calcination, NaBH4 reduction, and etching to form a hollow structure with true blackness. The computational bandgap calculation is conducted to determine the bandgap energy (Eg) of the white and black TiO2 with different crystalline structures. The blackness of the as-synthesized materials is determined by the Commission on Illumination (CIE) L*a*b* color system. FindingsThe hydrophilic nature of BSS-HNPs enables the formulation of hydrophilic paints, allowing the mono-layer coating. With the synergistic effects of hollow structure and the refractive index, BSS-HNPs manifested superb NIR reflectance at LiDAR detection wavelengths. The high detectability, blackness, and hollow structure of BSS-HNPs can expand the variety of LiDAR-detectable dark-tone materials.

Contribution of extractives to the bark color of Caesalpinia sappan

The purpose of this study was to investigate the contribution of Caesalpinia sappan (sappan wood) bark extractives by analyzing color change of the bark after extraction and the color of the extracts with several color measurement methods. Successive extraction was performed with n-hexane, ethyl acetate, methanol, and hot water. Color change of the bark was measured using CIELab color system and the extracts were analyzed with Ultraviolet-Visible Spectrophotometer, total phenolic content (TPC), and Gas Chromatography Mass Spectrometry (GC-MS). The results showed that the highest change on the bark color after methanol extraction with the Δa* and Δb* values of -2,53 ± 0,60 and -3,64 ± 1,20 respectively. Also, methanol extract showed the highest total phenolic content (860,24 ± 30,19 mg GAE/g). In addition, the Ultraviolet-Visible is analysis showed a peak at 478 nm in the hot-water soluble extract and two peaks in the methanol soluble extract at 396 nm and 478 nm. Hydroquinone was detected as one of the major compounds by Gas Chromatography Mass Spectrometry in the methanol soluble extract. It was suggested that the color of Caesalpinia sappan (sappan wood) bark as well as the deep red coloration of its extract might be contributed by multiple phenolic compounds contained in the methanol extract with hydroquinone as its precursor. Therefore, it is also a potential source for coloring matter.

전통가옥을 활용한 카페 인테리어의 내부 구성요소에 관한 연구

The main purpose of this study is to understand the versatility by analyzing the colors of the interior components of the cafe interior using modern traditional houses from three countries in East Asia. To this end, the concept and category of traditional houses were redefined and the characteristics of representative traditional houses in each country were described. Based on this, we sampled four cafes for analysis from cities in each country with clear characteristics of traditional houses. Each cafe sample has something in common: a modern remodel of the traditional architectural style. As a result of quantitative extraction and comparative analysis of the colors from the cafe sample image to the interior components (walls, ceilings, floors, and windows) using the Natural Color System (NCS), the interior components as a whole adhered to the traditional form and structure. The YR series showed medium brightness and chromaticity below medium saturation. This is a similar result to traditional colors. However, in the case of China, the use of color was significantly reduced, and in the case of Japan, it was confirmed that the use of color was higher in terms of brightness and saturation than traditional colors, confirming that the three kingdoms were largely evolving similarly in their use of color. This is analyzed to be in line with the globalization trend of universal standards and individualization of application.

Isolation and Characterization of an Antioxidant Aryl Polyene Pigment from Antarctic Bacterium Lysobacter sp. A03.

Lysobacter is known as a bacterial genus with biotechnological potential, producing an array of enzymes, antimicrobial metabolites, and bioactive antioxidant compounds, including aryl polyene (APE) pigments that have been described as protecting substances against photooxidative damage and lipid peroxidation. In this study, the pigment extracted from keratinolytic Lysobacter sp. A03 isolated from Antarctic environment was characterized. The results of KOH test, UV-vis spectroscopy, CIELAB color system, 1H-NMR, and FTIR-ATR spectroscopy suggest the pigment is a yellow xanthomonadin-like pigment. The in vitro antioxidant activity of the pigment was confirmed by the scavenging of ABTS and DPPH radicals. In silico analysis of the genome through antiSMASH software was also performed and the secondary metabolite gene clusters for APE and resorcinol synthesis were identified, suggesting that proteins responsible for the pigment biosynthesis are encoded in Lysobacter A03 genome.

Does artistic training affect color perception? A study of ERPs and EROs in experiencing colors of different brightness

Color is a visual cue that can convey emotions and attract attention, and there is no doubt that brightness is an important element of color differentiation. To examine the impact of art training on color perception, 44 participants were assigned to two groups—one for those with and one for those without art training—in an EEG experiment. While the participants had their electroencephalographic data recorded, they scored their emotional responses to color stimuli of different brightness levels based on the Munsell color system. The behavioral results revealed that in both groups, high-brightness colors were rated more positively than low-brightness colors. Furthermore, event-related potential results for the artist group showed that high-brightness colors enhanced P2 and P3 amplitudes. Moreover, non-artists had longer N2 latency than artists, and there was a significant Group × Brightness interaction separately for the N2 and P3 components. Simple effect analysis showed that N2 and P3 amplitudes were substantially higher for high-brightness stimuli than for lower-brightness stimuli in the artistic group, but this was not the case in the non-artist group. Additionally, evoked event-related oscillation results showed that in both groups, high-brightness stimuli also elicited large delta, theta, and alpha as well as low gamma responses. These results indicate that high-brightness color stimuli elicit more positive emotions and stronger neurological reactions and that artistic training may have a positive effect on top-down visual perception.

Synthesis and characterization of resorcinol based trisazo reactive dye ligand and its metal chelates for application on cellulosic fabric

The purpose of this research was to innovate novel trisazo reactive dyestuffs from 1, 2, 4-acid (the 1-amino-2-naphthol-4-sulphonic acid), the resorcinol derivativatized chemical substance, the vinyl sulphone para ester, and their transition metal chelates iron (II), nickle (II), copper (II), and zinc (II). For the synthesis, resorcinol in an alkaline medium was coupled to diazotized 1, 2, 4-acid (1-amino-2-naphthol-4- sulphonic acid) to create the 1, 2, 4-acid (the 1-amino-2-naphthol-4- sulphonic acid)- resorcinol mono-azo dye ligand. The 1, 2, 4-acid (1-amino-2-naphthol-4- sulphonic acid)- resorcinol mono-azo dye ligand was passed through coupling with the diazotized vinyl sulphone para este in an alkaline medium to generate tris-azo reactive dyestuff. Metal chelates of reactive dyestuffs have also been generated using 3d transition metals, namely iron, zinc, iron, copper, as well as nickel. The metallization of the synthesized monoazo dye ligands with sulphate salts of iron, nickel, copper, and zinc, as well as the coupling reaction with diazotized vinyl sulphone para ester resulted hot brand novel vinyl sulfone-type trisazo fiber reactive dyes. To evaluate how successfully the novel synthesized dyestuffs dyed cotton fabric, these were applied to cotton fabric in one percent, three percent, and six percent (stock) solutions relative to the weight of cotton fabric, and were examined for their characteristics. These showed excellent light fastness, rub fastness, and wash fastness when applied to cotton fabric. Analytical data and spectroscopic techniques allying optical studies thereby UV-Visible spectroscopy and FTIR spectral interpretation were utilized to confirm the constituents of whole innovative, novel synthesized tris-azo reactive dye substances. Maximum synthesized tris-azo reactive dyestuffs found to have large values of their wash fastness 4 and above on the grey scale, and light fastness 4 and above on the blue scale, respectively, when dyed on cotton cloth. A comparative study of these dyes was also done with existing standards, the pantone color system. The dye adhesion, reactivity, dissolution, as well as stabilizing qualities were all outstanding, indicating that the fabric was well dissolved. Such artificial trisazo reactive dyestuffs were transferred attractively onto the colored cotton cloth, evenly distributed, well permeated into the fiber, and fastened. Consequently, tris-azo reactive dyestuff ligand, and its metal chelates were appraised accomplished wonderfully, while colored cotton cloth. These dyestuffs will further benefit the creation of innovative industrial items. Consequently, this in-house production of creative resorcinol-based dyestuffs will also usher in a futuristic era of investigation for the country’s economic advancement, and in industrialization.

Wearable and interactive multicolored photochromic fiber display

Endowing flexible and adaptable fiber devices with light-emitting capabilities has the potential to revolutionize the current design philosophy of intelligent, wearable interactive devices. However, significant challenges remain in developing fiber devices when it comes to achieving uniform and customizable light effects while utilizing lightweight hardware. Here, we introduce a mass-produced, wearable, and interactive photochromic fiber that provides uniform multicolored light control. We designed independent waveguides inside the fiber to maintain total internal reflection of light as it traverses the fiber. The impact of excessive light leakage on the overall illuminance can be reduced by utilizing the saturable absorption effect of fluorescent materials to ensure light emission uniformity along the transmission direction. In addition, we coupled various fluorescent composite materials inside the fiber to achieve artificially controllable spectral radiation of multiple color systems in a single fiber. We prepared fibers on mass-produced kilometer-long using the thermal drawing method. The fibers can be directly integrated into daily wearable devices or clothing in various patterns and combined with other signal input components to control and display patterns as needed. This work provides a new perspective and inspiration to the existing field of fiber display interaction, paving the way for future human–machine integration.

The influence of the Cr2O3–Mn2O3 colorants system on the spectral characteristics of R2O–PbO–SiO2 glasses

AbstractThe focus of this paper centers on an exploration of optical glasses with high transmittance within the infrared spectrum at wavelength of 1 060 nm, while concurrently demonstrating full absorption within the ultraviolet and visible spectral ranges. The paper analyzes the present state of glasses demonstrating necessary transmittance at IR range, considering their inherent strengths and limitations. In this context, an R2O–PbO–SiO2 glass system with Cr2O3–Mn2O3 colorants system emerges as the subject of this research. Research was conducted to comprehensively assess the impact of this colorant system on the glass spectral characteristics, while considering the potentially detrimental influence of FeO.The principles underlying the industrial production of these glasses are systematically elucidated and presented. It was discovered that using gas heating during the cooling phase of glass melting resulted in the disruption of the spectral homogeneity of the glass, ultimately leading to defective product outcomes. Implementing the methodology of gasless temperature reduction (inertial cooling process) before glass pouring has created a favorable environment for producing high‐quality items. Glass samples from the laboratory tests were obtained, and the researched glass was integrated into serial production.

Evaluating color stability and enamel surface roughness following resin infiltration treatment.

To assess the impact of resin infiltration treatment on enamel color stability and surface roughness after simulating daily exposure to coffee stains and regular toothbrushing with standard toothpaste. In this in vitro study, we utilized 47 caries-free human enamel specimens, which were divided into two distinct groups. The teeth in the study group underwent artificial demineralization, Icon resin infiltration, and polishing, while the control group received only polishing. Following this, all teeth from both groups were regularly immersed in freshly brewed coffee for 15 min, twice daily, over a span of 30 days. After each staining session, the teeth underwent 10 heavy circular strokes using a soft toothbrush and standard toothpaste. Color changes were measured on Days 1 and 30 using a spectrophotometer. The L*, a*, b* color system defined by the International Commission on Illumination was used to assess the changes. Surface roughness was evaluated at baseline and after 30 days using a 3D surface Metrology Microscope. After 30 days of immersion in coffee, both the study and control groups showed significant changes in color. However, differences were statistically significant between groups for "L" and "a" parameter but not for "b." The overall color change in the study group was higher than the control group. There were no significant differences in surface roughness within or between the groups before and after staining and brushing. Resin infiltration leads to a significant increase in staining compared to untreated enamel. These staining properties should be taken into account when making clinical decisions regarding the treatment of white spot lesions.

Investigation of color protection of laminated glass by UV-blocking interlayers for conservation application

The damaging of color pigments under UV radiation, usually called fading, is known, the most common is the loose of color intensity of clothes. A high UV-resistance of window and façade glazing is urgent for the conservation and preservation of historical exhibits and interiors. In this contribution, a long-lasting natural weather testing of several glass types, mostly LSG with different interlayer materials, and the effect of the different color patterns of paper and textile specimens are presented. According to the Harrison damage function, the initial damage level starts at 500 nm wavelength. Therefore, besides standard PVB-interlayer (UV-blocking from 360 to 380 nm wavelength) also special UV-blocking interlayer (UV-blocking from 400 nm) are part of the study. The research was conducted over the full summer of the year 2021. The assessment of the fading effect was measured as color spacing according to the CIELAB color space and verified by human eye perception. The CIELAB color space is the most used color system and combines brightness, yellow-blue and red-green tones. The research shows a significant effect of different glass build-ups on the color spacing value, especially for medium-sensitive pigment papers and textiles. Furthermore, the color shifting of single color scale samples showed demonstrated the limitation of the color spacing value of the CIELAB color space versus the human eye perception.

A digital image-based colorimetric method for measuring free acidity in edible vegetable oils

The standard method used to quantify free acidity (FA) in vegetable oil is neutralization titration, which requires many toxic chemicals and depends on an analyst's experience in detecting endpoints. Here, a digital image colorimetry (DIC) method using a smartphone camera was developed to measure FA in vegetable oils. A cupric acetate solution was used to produce the colorimetric reaction. The coloured solutions were imaged, and R values (from the RGB colour system) were calibrated against the respective FAs in the standards. The FA values of the samples were determined by standard addition calibration. These results were compared to measurements of FA obtained by the standard titrimetric method. An excellent correlation was obtained, with an R2 of 0.98 and a mean absolute error of 0.06%. The chemicals needed for analysis were reduced by approximately 90%. Thus, DIC is a less subjective and more economical method for determining FA in vegetable oils.

Color Analysis of Merkel Cell Carcinoma: A Comparative Study with Cherry Angiomas, Hemangiomas, Basal Cell Carcinomas, and Squamous Cell Carcinomas.

Merkel cell carcinoma (MCC) is recognized as one of the most malignant skin tumors. Its rarity might explain the limited exploration of digital color studies in this area. The objective of this study was to delineate color alterations in MCCs compared to benign lesions resembling MCC, such as cherry angiomas and hemangiomas, along with other non-melanoma skin cancer lesions like basal cell carcinoma (BCC) and squamous cell carcinoma (SCC), utilizing computer-aided digital color analysis. This was a retrospective study where clinical images of the color of the lesion and adjacent normal skin from 11 patients with primary MCC, 11 patients with cherry angiomas, 12 patients with hemangiomas, and 12 patients with BCC/SCC (totaling 46 patients) were analyzed using the RGB (red, green, and blue) and the CIE Lab color system. The Lab color system aided in estimating the Individual Typology Angle (ITA) change in the skin, and these results are documented in this study. It was demonstrated that the estimation of color components can assist in the differential diagnosis of these types of lesions because there were significant differences in color parameters between MCC and other categories of skin lesions such as hemangiomas, common skin carcinomas, and cherry hemangiomas. Significant differences in values were observed in the blue color of RGB (p = 0.003) and the b* parameter of Lab color (p < 0.0001) of MCC versus cherry angiomas. Similarly, the mean a* value of Merkel cell carcinoma (MCC) compared to basal cell carcinoma and squamous cell carcinoma showed a statistically significant difference (p < 0.0001). Larger prospective studies are warranted to further validate the clinical application of these findings.

Comparison of color changes, fracture strengths, and failure modes of conventional endocrowns and endocrowns with different design modifications.

Endocrowns (ECs) are alternatives for rebuilding severely damaged teeth and show superior efficacy in molars over premolars. The objective of this in vitro study is to evaluate the effects of different preparation designs with short pulp chambers on the mean color change (Δ⁢E), fracture resistance, and failure types of mandibular molar ECs. A total of 40 extracted mandibular molars were treated endodontically and divided into four groups. Samples in groups 1, 2, 3, and 4 had occlusal preparation depths of 5 mm, 3 mm, 3 mm with ferrule, and 3 mm with boxes, respectively. The samples were immersed in coffee and their Δ⁢E values were measured by using the Commission Internationale de l'Eclairage color system. They were also subjected to a fracture test. Next, all specimens were examined visually under a stereomicroscope to evaluate their failure modes and identify their fracture origins. Data were entered and analyzed by using Statistical Package for Social Sciences. Among all groups, group 4 (3 mm + boxes) presented the highest Δ⁢E (4.15) after immersion in coffee. Moreover, ANOVA revealed that the Δ⁢E of group 4 (occlusal preparation depth of 3 mm with boxes) was significantly different (p< 0.05) from that of group 2 (3 mm + ferrule, 3.07). The EC with a 3 mm chamfer and ferrule showed the highest maximum load of 2847.68 ± 693.27 N, whereas that with a 5 mm chamfer finish line had a marginally reduced load at fracture of 2831.52 ± 881.83 N. The EC with a 3 mm chamber and boxes had a slightly increased maximum load of 2700.75 ± 436.40 N, whereas that with the 3 mm chamber had the lowest maximum load at fracture of 2385.97 ± 465.61 N. One-way ANOVA showed that different EC preparation designs had no effect on maximum fracture load (F [3,16] = 0.550, p= 0.6). The recorded Δ⁢E values of ECs in all groups were equal or marginally higher than the acceptable values. The EC with a 3 mm chamfer and ferrule displayed the highest mean maximum load. The EC with a 5 mm chamfer finish line had a marginally lower maximum load at fracture than other ECs. Failures, such as ceramic fracture, split fracture, and ceramic and tooth splitting above the cemento-enamel junction (CEJ) or vertically were predominant in samples with occlusal preparation depths of 3 mm with ferrule and 5 mm.

Research on Tang-Style Garden Color Characteristics and Application Strategy

Garden colour plays an important role in creating spatial atmosphere, mood and regional landscape characteristics. At present, there are more studies on the colours of the existing Jiangnan gardens, while there are fewer studies on the colours of the Tang-style gardens built since modern times. In order to further explore the colour characteristics of Tang-style gardens, based on the natural colour system, the garden colours are divided into dynamic colours and static colours, and the colour characteristics of Tang-style gardens are initially explored, so as to further excavate the colour culture of Tang-style gardens, and to promote the protection of the colour culture of Tang-style gardens, in order to protect the traditional colours of the mood of the theme and the translations, and to inherit and promote the traditional use of colours in China.

Boja odeće kao estetski i komunikacioni faktor i sistemi boja

The clothes we wear are not only a physical means of protection from the cold and the sun, but also have a cultural component in the domain of non-verbal visual communication. In any occasion and environment, the color of the clothes attracts attention. Color symbolism is important for fashion designers because the colors of different parts of clothing evoke certain connotations, which depend on the situation in which the clothing is worn. The color of clothes has a psychological effect on people and leaves a strong impression when contacting another person. The first part of the paper describes the importance of color from the aspect of aesthetics and communication ability of clothes, i.e. the promotional effect of color on the recognition of the usefulness of the product by customers. In the second part, the color systems that are important for the clothing industry and the numerical evaluation of color are described

Color Changes in Artificially Induced Incipient Caries after Photodynamic Therapy with Different Concentrations of Methylene Blue and Toluidine Blue and Irrigation with Water and Hypochlorite.

The aim of this study was to assess the color changes in artificially induced incipient caries after photodynamic therapy (PDT) using different concentrations of methylene blue and toluidine blue, along with irrigation using water and hypochlorite. Forty-two sound human premolar teeth were used to create two artificial incipient carious lesions. One lesion was placed on the buccal surface and the other on the lingual surface. The color of these artificial incipient carious surfaces was determined using the CIE L ∗ a ∗ b ∗ color system. The teeth were then randomly assigned to 12 groups (n = 7) based on the PDT method. These methods included methylene blue with concentrations of 50, 100, and 150 µg/mL, followed by water irrigation, methylene blue with concentrations of 50, 100, and 150 µg/mL, followed by hypochlorite solution irrigation, toluidine blue with concentrations of 50, 100, and 150 µg/mL, followed by water irrigation, and toluidine blue with concentrations of 50, 100, and 150 µg/mL, followed by hypochlorite solution irrigation. The teeth underwent a colorimetry procedure again, and the resulting color changes were calculated. A three-way ANOVA was performed to analyze the effects of laser wavelength, concentration of the light-absorbing material, and irrigation solution on ΔE. The results showed that the color changes caused by toluidine blue photosensitizer at a concentration of 100 µg/mL, with both water and hypochlorite irrigation, were not noticeable to the naked eye (ΔEwater = 3.04, ΔEhypochlorite = 2.00). However, in the other study groups, the color changes were perceptible (ΔE > 3.3). There were no significant differences in ΔE between different concentrations of methylene blue and toluidine blue when using either water or hypochlorite irrigation (P > 0.05). A significant difference was observed between methylene blue and toluidine blue at a concentration of 100 µg/mL with water irrigation (P=0.006). Additionally, a significant difference was found between methylene blue and toluidine blue at a concentration of 100 µg/mL with hypochlorite irrigation (P=0.049). However, no significant differences were observed between methylene blue and toluidine blue at other concentrations with either water or hypochlorite irrigation (P > 0.05). In conclusion, tooth color in teeth with incipient caries did not change significantly after PDT using toluidine blue (the photosensitizer) at a concentration of 100 µg/mL with either water or 1% hypochlorite solution irrigation for 5 s.

COLOR STABILITY OF THREE PROVISIONAL MATERIALS AFTER EXPOSURE TO TWO CHROMATOGENS BEFORE AND AFTER THERMOCYCLING – AN IN VITRO STUDY

Aim - The present investigation was done with an aim to evaluate and compare the effect of two chromatogens on color stability of three provisional materials before and after thermocycling. Materials and methods - Three commercially available provisional materials were chosen - DPI heat cure, Protemp™4 chemical cure and the relatively newer Luxatemp Solar dual cure material. Flat circular metallic dies were prepared of 22 mm diameter and 2 mm thickness. Total 150 samples were prepared from the materials using these dies. The samples were finished and polished using standardized methods. They were divided into five groups. Two groups from each material were subjected to a standardized thermocycling regimen. The samples were immersed in two staining solutions - coffee solution and sambhar curry solution for 30 days. Artificial saliva was used for the control group. The solutions were prepared using a standardized method and were changed every day. The color measurements were done twice - once before thermocycling and staining and once after, in CIE L*a*b* color system using a reflectance spectrophotometer. Results – Statistical analysis was done in SPSS version 20.0 using One-way ANOVA and Tukey’s post-hoc test. p value &lt;0.05 was considered statistically significant. Conclusions – New material Luxatemp Solar showed least color stability, followed by Protemp™4 whereas DPI showed maximum color stability. Sambhar curry showed higher staining ability. The color changes seen with coffee and control were not clinically perceptible. Thermocycled samples showed more color change than non thermocycled samples.