Depth Of Shade Research Articles

Phenolic Compounds, Dyeing Potential, and Cytotoxic Activity ofAlkanna orientalisL. Boiss (Boraginaceae)

Dyeing of cotton, viscose, wool, and polyester/viscose blended fabrics has been carried out with the aqueous extract of the roots of Alkanna orientalis plant. Fastness properties and color strength values were investigated in terms of users. Phenolic compounds and cytotoxic activities of ethanol (EtOH) and water extracts were determined. It was found that cotton fabric dyed with the aqueous extract of the roots of A. orientalis plant in the presence of alum mordant gave better depth of shade (K/S). The toxicity studies reveal that the EtOH and the water extracts of the root of A. orientalis exhibited 0% cytotoxicity while the standard cancer drug 5-fluorouracil exhibited 6% cytotoxicity. The overall results of this study show that the roots of A. orientalis can be used in the textile industry, especially for dyeing cotton fabrics.

Simultaneous Sonochemical Coloration and Antibacterial Functionalization of Leather with Selenium Nanoparticles (SeNPs).

The development of antibacterial coatings for footwear components is of great interest both from an industry and consumer point of view. In this work, the leather material was developed taking advantage of the intrinsic antibacterial activity and coloring ability of selenium nanoparticles (SeNPs). The SeNPs were synthesized and implemented into the leather surface by using ultrasonic techniques to obtain simultaneous coloring and functionalization. The formation of SeNPs in the solutions was evaluated using UV/Vis spectroscopy and the morphology of the NPs was determined by transmission electron microscopy (TEM). The treated leather material (leather/SeNPs) was characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The effects of SeNPs on the coloration and antibacterial properties of the leather material were evaluated. The results revealed that the NPs were mostly spherical in shape, regularly distributed, and closely anchored to the leather surface. The particle size distribution of SeNPs at concentrations of 25 mM and 50 mM was in the range of 36–77 nm and 41–149 nm, respectively. It was observed that leather/SeNPs exhibited a higher depth of shade compared to untreated ones, as well as excellent fastness properties. The results showed that leather/SeNPs can significantly enhance the antibacterial activity against model of bacteria, including Gram-positive bacteria (Bacillus cereus) and Gram-negative bacteria (Pseudomonas aeruginosa, Salmonella typhi and Escherichia coli). Moreover, the resulting leather exhibited low cytotoxicity against HFB4 cell lines. This achievement should be quite appealing to the footwear industry as a way to prevent the spread of bacterial infection promoted by humidity, poor breathability and temperature which promote the expansion of the microflora of the skin.

An investigation into the fastness and mechanical properties of p‐aramid fabric dyed with disperse dye

AbstractThe p‐aramid fiber is mostly used in high tech applications such as protective clothing, cut resistant gloves, heat resistant suits, etc. due to its extraordinary mechanical and thermal properties. On the other hand, it loses its strength upon exposure to UV (ultraviolet) light. The main purpose of this work is to optimize p‐aramid fabrics dyeing with disperse dyes and study the impact of dye on its properties such as shade depth (K/S), fastness, and UV degradation. The batch process is used to dye the fabric with disperse dyes that give high K/S value. The ANOVA (analysis of variance) is performed for the result investigation, depicting the input and output variables relation. The mechanical loss of p‐aramid on exposure to UV was confirmed by bursting strength showing 28% strength loss in comparison to the dyed p‐aramid fabric having 15% loss in strength. This was further endorsed by scanning electron microscope and X‐ray diffraction by investigating the changes in surface morphology and crystallinity on exposure to UV simultaneously to confirm the hypothesis that dyeing reduces the degradation upon exposure to UV light.

Dyeing of Cotton Fabric with Natural Dye Extracted from Egyptian Cotton Leaves

Cotton leaves have been used to extract natural dye for dyeing of Egyptian cotton variety Giza 86 fabric and its blend with polyester 50:50, using different mordants such as iron (II) sulfate, copper (II) sulfate, and alum. The exhaust dyeing method was utilized using the pre-mordant technique. It is observed that both fabric samples can be dyed in different colors and depth of shades with Cotton leaves dye. Iron (II) sulfate ensures the best light fastness. Improved light fastness is obtained using abovementioned lower amounts of iron (II) sulfate and copper (II) sulfate. Alum is found to be less effective than iron (II) sulfate and copper (II) sulfate on the light fastness. As a novel alternative and potential natural dye, Cotton leaves extract solution can be used to get various colors and shades with satisfactory fastness properties. The mordanted and un-mordanted fabric samples were tested for their dyeing performance in terms of color parameters K/S, (L*), a*, b*, (C*) and (H*), and fastness properties (wash, perspiration, light and rubbing fastness) were studied. The samples showed high color strength, and high fastness properties. These results are very important for industrial application and with the production of a natural dye as an inexpensive source from cotton leaves as a by-product. Another objective is to increase the production of eco-textile garments with a good price for the Egyptian customers.

A Research of Color and Fastness Values on Silk, Wool and Cotton Fabrics Dyed with Pulp of Oregano (Origanum onites) and Sage (Salvia tomentosa)

One of the most important problems of natural dyeing is lack of raw material. In the recent years, researchers are aimed to solve the deficiency of raw material. The pulp of plants which are obtained from the steam distillation, are used as a dyestuff. We assume that the dyestuff in pulp of oregano and sage after steam distillation remain stable. Wool yarns and silk fabrics have been dyed in previous works done as a master and a Proficiency in Art thesis. The results were showed that our assumption is correct. Based on these results further researches were done. The textile materials were dyed with %100 of pulp of oregano and sage. Mordant dyeing method was applied and three different mordant materials were applied with pre-mordant process. Alum [Kal(SO4)2.12H2O], ferrous (II) sulphate [FeSO4.7H2O] and potassium dichromate [K2Cr2O7] were used as a mordant and potassium bitartrate [KC4H5O6] as an auxiliary agent in alum mordanting. Rubbing (dry and wet) and washing fastness values were determined. Also the depths of shade were evaluated in terms of K/S and CIELAB colour difference values of the dyed fabric samples. According to the results obtained from the dyeing, the capability of pulp of plants is adequate and will supply the lack of the dyestuff. While the colors obtained from silk and wool fabrics are more vivid and dark, the colors of cotton fabrics are quite pale. This study will allow other pulp of plants to be evaluated in this way.

Effective reduction clearing parameters involving alternative reducing agent

Dyeing of polyester is done by using disperse dyes. Some of the disperse dyes remain unfixed during dyeing and create problems in shade and colorfastness properties. Reduction clearing (RC) is a process to remove these unfixed dyes and to enhance colorfastness properties. In the Pakistani textile industry, reduction clearing is being done by using sodium dithionite (Na2S2O4), which has the best results in reducing dyestuff. The problem with sodium dithionite is that it is sensitive to air and also creates a lot of environmental issues. Its sensitivity causes inconsistent results of reduction clearing. Different dyers used different processes and recipes of reduction clearing. Thiourea Dioxide (TUD) is a green reducing agent and can be used as a replacement for sodium dithionite. TUD (CH4N2S) is a stable product with a comparable result with sodium dithionite. Interlock knitted fabric is used in this project whose composition has recycled polyester. The fabric was first dyed using black dyestuff and then reduction clearing was done on a lab-scale with different factors (Shade depth, the concentration of TUD, RC temperature). Three colorfastness tests were conducted to evaluate the different levels of each factor i.e. colorfastness to washing, fastness to perspiration, and fastness to water according to standard numbers ISO 105-C06, ISO 105-E04, and ISO 105-E01, respectively. It was observed that shade depth does not affect the results while concentration and RC temperature have a significant effect on the results. Moreover, the effective concentration of TUD was also determined.

Durable surface functionalisation and pigment coloration of cellulosic fabrics using bioactive additives

AbstractThe main goal of this study is to develop a facile eco‐friendly method for antibacterial/ultraviolet (UV)‐blocking functionalisation using various green bioactive functional additives namely neem, jojoba, argan, aloe vera, ginger, and tulsi. In addition, pigment coloration of cellulosic substrates including cotton, viscose, cotton/viscose, and cotton/linen using pigment colourants and appropriate printing auxiliaries in one step was used. The experimental results revealed that the durability, improvement in the imparted antibacterial/UV‐blocking functional properties and enhancement in the depth of the obtained pigment prints followed a decreasing order: tulsi > ginger > aloe vera > argan > jojoba > neem ≫ none, keeping other parameters constant. The obtained data also demonstrated that the developed pigment prints exhibited remarkable functionalities and depth of shade after 15 washing cycles. Moreover, it was observed that improvement in the imparted functional and coloration properties were a function of types of cellulosic substrate and the kind of colourant. Scanning electron microscopy (SEM), and energy‐dispersive X‐ray spectroscopy (EDX) analysis for selected samples confirmed the surface modification, morphology changes and immobilisation of the used active ingredients onto the treated substrates.

The development of a tannin-based after-treatment for cotton fabric dyed with sulphur dyes

PurposeSulphur dyes provide an inexpensive medium to dye cellulosic fibres with heavy shade depths. They offer moderate to good fastness to light and wet treatments. However, owing to the environmental hazard produced by the use of sodium sulphide, the practical implication of these dyes is steadily decreasing. Moreover, these dyes are prone to oxidation causing pronounced fading on exposure to laundering. This paper aims to present the green processing of sulphur dyes by using a biodegradable reducing agent in place of sodium sulphide to dye cotton fabrics. The study also proposes after-treatments with tannin to improve the fastness properties of the dyeings.Design/methodology/approachIn this study, dyeings were produced on cotton fabric with a range of C.I. Leuco Sulphur dyes, which were reduced with sodium sulphide and glucose. Sulphur dyeings were after-treated with an environment-friendly tannin-based product (Bayprotect CL (BP)); subsequently, the after-treated samples were evaluated for colour strength, wash, light and rubbing fastness.FindingsA novel after-treatment method was developed, which substantially improved the wash fastness of C.I. Leuco Sulphur Black 1 dyeing to ISO 105 C06/C09 washing. However, the degree of this improvement varied for the other sulphur dyes used. The surface morphology and the possible mechanisms for the improved fastness properties were also discussed.Research limitations/implicationsThe effect of after-treatment was significant for improving the wash fastness of sulphur black dyeings in particular, while the effect on other colours was minor. Significant improvements were observed for light and wet rub fastness for most of the dyeings, which signifies the importance of tannins as a finishing agent.Practical implicationsIt is observed that the tannin-based product, BP, is found to provide the photoprotective effect by improving the lightfastness of the dyeings. Future research may involve the exploration of various tannins as a finishing agent to sulphur dyeings.Originality/valueThis novel finishing technique is found significant for improving the wash fastness of sulphur black 1 dyeings for both the reducing systems. Improvements were also observed for light and wet rub fastnesses for most of the dyeings.

Impact of Bleaching before or after Veneer Preparation on Color Masking Ability of Laminate Veneers: An In Vitro Study.

Purpose This study evaluates the effect of bleaching before or after veneer preparation and the depth of preparation on color masking ability of laminate veneers. Methods. Sixty extracted premolars were artificially stained to vita shade A4, verified by digital spectrophotometer (Vita Easy Shade V), and then divided into three groups: NB = nonbleached, BBP = bleaching before preparation, and BAP = bleaching after preparation. Based on the preparation depths, each group was further divided into two subgroups: S1 = 0.5 mm and S2 = 1.0 mm. BBP and BAP were subjected to one session of in-office bleaching using 35% hydrogen peroxide. IPS e-max CAD veneers of 0.5 and 1.0 mm thickness (corresponding to the preparation depths) of the same shade and translucency (HT A1) were cemented immediately to the bleached surfaces. Immediately after cementation, the color change ΔE between the baseline (after staining) and the resulted shades was measured using the Vita Easy Shade V digital spectrophotometer and CIELab color system. Results Bleached groups exhibited a significant ΔE value compared to the nonbleached group (p < 0.05). BAP showed the highest ΔE value. No significant difference was found between BBP and BAP. S2 revealed a significant ΔE value than S1 (p < 0.05). No significant difference was found between S1of BAP and S2 of NB, BBP, and BAP (p > 0.05). Regarding the color coordinates, the difference between the tested groups was highly significant in lightness (ΔL∗) (p < 0.001), while no significant differences were found in green/red value (Δa∗) and yellow/blue value (Δb∗) (p > 0.05). Conclusions In cases of severe tooth discoloration, one session of in-office bleaching before or after veneer preparation and the preparation depth do not influence the color masking ability of laminate veneers.

Green dyeing of modified cotton fabric with Acalypha wilkesiana leave extracts

Over the last few decades, a number of natural dyes have become non-toxic, eco-friendly and biocompatible substitutes of highly carcinogenic synthetic dyes. Herein, we selected the Acalypha wilkesiana (copper plant) as the source of a natural colorant for auxiliary-free dyeing of cotton, a way forward to eco-friendly dyeing. The bioactive phytochemical constituents of this plant include tannins, flavonoids, phlobatanins, cardiac glycosides, saponins, alkaloids, terpenes and steroids. Both the aqueous and methanol extracts of copper leaf were extracted and applied to unmodified and modified cotton fabrics with the percentage shade depths of 0.5%, 1%, 2%, 4%, 5% and 6% both at pH 4 and 7. The cationized samples rendered substantial improvement in color strength (K/S) values as compared to un-cationized ones. Aqueous and methanolic extracts offered very similar K/S values on cationized samples. Without using any metallic salts as mordants, the color fastness properties like rubbing fastness, washing fastness were also slightly improved due to greater dye fixation on cationized samples compared to uncationized ones. In conclusion, the aqueous extract exhibited dye fixation and color fastness properties comparable to methanolic extract at pH 4 and 7. Thus, it suggested the avoidance of toxic organic solvent for extraction and auxiliary chemicals in subsequent dyeing, a step towards eco-friendly sustainable dyeing.

Sustainable antibacterial printing of cellulosic fabrics using an indigenous chitosan-based thickener with distinct natural dyes

PurposeChitosan is widely considered as a natural polymer and a diverse finish to impart antibacterial property and enhanced dye uptake of textiles. Herein, the authors have investigated the feasibility of using chitosan/starch blend as a thickener in screen printing of cellulosic fabrics with some natural dyes.Design/methodology/approachThe polymeric blend of chitosan/starch was prepared and used as a thickener for screen printing with three natural dye extracts, namely, Curcuma tinctoria (turmeric), Beta vulgaris (beet) roots and Lawsonia alba (henna) leaves on cellulosic fabrics like cotton and viscose. The viscosity and rheological properties of print paste as a fresh and after overnight shelving were examined. The influence of polymeric blends on cellulosic fabrics' print properties was inspected by determining their colorfastness, rubbing fastness, tensile strength and antibacterial activity.FindingsThe results depicted that chitosan/starch blend as printing thickener increased the shade depth with good wet and dry rubbing fastness for all the test natural dyes. The antibacterial activity of resultant printed cellulosic fabrics was found to be satisfactory against broad-spectrum bacterial strains.Practical implicationsThis study's outcome is the development of chitosan blend thickeners to print the cellulosic fabrics with indigenous natural dyes.Originality/valueThe authors found no previous report on the synthesis of chitosan-based antibacterial blend thickeners with three distinct natural dyes and their application in screen printing of native and regenerated cellulosic fabrics of cotton and viscose, respectively.

New Strategy to Enhance Transfer printing and Functional Finishing of Polyester fabric

This research work is aimed to upgrade the transfer printability, the UV-protection and antibacterial functionalities of polyester woven fabric via alkali-treatment followed by post-loading of functional agents namely PVP, Triclosan, Chitosan, metal oxide nano particles MO-NPs i.e. TiO2, ZrO2, ZnO-NPs individually. The modified fabric samples were subsequently transfer printed with certain disperse dyes. The effect of treatment sequence and type of the used additive on the printability and functionality of the polyester prints were investigated. The results revealed that the creation of hydrophilic active sites namely carboxyl and hydroxyl end groups at the fabric surface, as well as loading and fixation of the used functional agents onto the finish/fabric matrix brought about polyester prints with a darker depth of shades, excellent antibacterial activity, and higher UV-protecting functionality compared with the untreated one.

Sustainable Dyeing of Silk with Natural Dyes Using Natural Sources of Water

River water containing different types of metals and heavy metals are far more efficient in promoting surface colour strength and all round colourfastness properties of silk fabrics when dyed with aqueous extract of Ceriops decandra and Diospyros malabarica. However, pre-mordanting with aluminium and/or ferrous sulphate would promote the depth of shade and colourfastness properties further. Calcium and magnesium are found to be present in appreciable amount in the different river water considered in this study and are found to be higher than that present in water collected from Kolkata Municipality Corporation. Analysis of different river and aquifer water showed the presence of different metals and heavy metals and their value stays well below the specified permissible limit as mentioned in WHO standard. The presence of such trace amount of different metals played a significant role in promoting dye uptake and all round colourfastness properties also. The presence of such metal in the dyed fabric also appeared to stay much below the limit of Oeko-Tex standard referred often for producing environment friendly textiles.

Eco-friendly isolation of tannin based natural colorant from coconut coir (Cocos nucifera) for dyeing of bio-mordanted wool fabric

&lt;p&gt;Due to hazardous effluent load of synthetic dyes, the global community is now seeking inclusion of natural products particularly green dyes and pigment in various fields. Current study has been concerned with utilization of eco-friendly tools for isolation of colorants from plant wastes such as coconut coir (Cocos nucifera) for coloration of natural fibers such as wool. Coconut based Tannin was isolated after exposure by microwave treatment for 1-6 min in various media following by optimization of dyeing variables. Excellent yield onto fabric were obtained when coconut coir extract of 1 pH containing 5g/100 mL Glauber salt, was used to dye at 65 oC for 65 min. To develop new shades among mordants used, bio-mordanted wool fabrics exhibited more excellent shades than chemical ones with excellent fastness ratings. It has been concluded that Microwave treatment has excellent potential to isolate natural dye from plant wastes, where the introduction of bio-mordants for shade depth and fastness characteristics has made process more sustainable and viable for natural fibers coloration.&lt;/p&gt;&#x0D;

Dyeing of cotton and silk using vegetable kitchen waste: A step towards sustainability

Vegetable wastes occur throughout the supply chain. Globally, around 20% loss occurs at consumer levels, of which post-harvest and food processing level wastages account for 80% share. Wastes pose environmental threats and call for the development of a model to recycle this unutilized waste in potential avenues. The study focuses on sourcing of vegetable &amp; fruit kitchen waste and extracts the dyes from waste to create a concrete framework in managing the kitchen waste towards using it for textile dyeing. The study will compare microwave extraction and conventional extraction method (exhaustion) and dyeing processes in terms of depth of shade and hue. The present results have demonstrated that the affinity of vegetable kitchen waste material as a source of natural coloring agents for dyeing proteinic silk fabric is higher than cellulosic cotton fabric by using both conventional and microwave assisted dyeing. Compared to conventional the microwave-assisted extraction and dyeing technique is highly effective in terms of saving the processing time, energy, and resources. Other additional features about microwave is that it is cheaper, more economical, energy saving and thereby eco-friendly. Consumers believed as expressed in the opinion survey that this research idea is excellent and will help in reducing waste.

Study on the factors influencing the dyeing performance of cotton fabric with vat dyes based on principal component analysis

Color performance on textiles is affected by many factors. In order to make the color presented more precisely, it is necessary to clarify the relationship between fabric structure and dyeing effect, so as to compensate the color displayed according to different fabrics in color matching. Pad dyeing of different cotton fabrics with vat dyes was carried out, and principal component analysis was used to analyze the comprehensive properties of fabrics. According to the factor weight, the main factors affecting the dyeing effect were obtained, and a mathematical regression model between the comprehensive values of fabric properties and the dyeing effect was established. The results showed that with the increase of dye concentration, the apparent shade depth of the fabric increased correspondingly. For different fabrics with the same dye concentration, their apparent shade depth varied with the fabric structure. There were five main factors affecting the dyeing effect of fabrics, which was glossiness, whiteness, weft density, roughness, gram weight. The comprehensive values of fabric properties were negatively correlated with the K/S values after dyeing. The smaller the comprehensive value of fabric, the deeper the apparent color after dyeing.

Eco-friendly production of anti-UV and antibacterial cotton fabrics via waste products

A new and simple method based on natural dyeing was developed for producing antibacterial and biodegradable cotton fabrics. Using the aqueous extraction procedure, a natural dye was extracted from boiled pomegranate rinds and prepared into a fine powder. The whey protein isolate was used as an ecofriendly mordant to increase the affinity of cotton fabrics to the pomegranate rind extract. The different dyeing parameters, including dye concentration, temperature, time, and dyeing bath pH, were optimized via reflectance spectrophotometry using the three different pre-mordanting, simultaneous mordanting, and post-mordanting dyeing methods. The pre-mordanting method performed at a temperature of 80 °C yielded the best overall efficiency in terms of dye color strength and depth of shade under the optimized dyeing conditions of a concentration of 70%, pH = 4.5, time = 80 min, a material to liquid ratio of 1:20, and a temperature of 90 °C. The bio-fabrics thus produced exhibited excellent wash and light fastness. The results of FTIR spectroscopy confirmed the chemical interaction between cotton fabrics and the combination of WPI/dye agents. Moreover, SEM micrographs revealed the homogeneous surface morphology of the bio-fabrics without any microscopic cracks or discontinuities in the sample surface. Results also revealed that, with 18 h of contact time, the proposed ecofriendly method was able to produce bio-fabrics that maintained desirable antibacterial properties against pathogenic and spoilage bacteria, even after 10 washing cycles and also exhibited excellent protection against ultraviolet radiation. The results confirmed that this procedure is promising for producing dyed fabrics for biomedical applications without adverse environmental effects and that the natural mordant used is a good replacement for the commonly used metallic ones.

Lyocell Fabric Dyed with Natural Dye Extracted from Marigold Flower Using Metallic Salts

Abstract The application of natural dyes is increasing each year due to their environmental friendliness and easy application on cellulose fibers. In this study, the natural dye from the Mexican marigold flower was extracted using a Soxhlet extraction apparatus. The extracted natural dye was applied on lyocell fabric with five different metallic salts using pre-mordanting and post-mordanting methods. It was observed that different color shade depth was achieved with different fixing agents. The color shade depth (K/S) washing fastness, light fastness, rubbing fastness, perspiration, and Fourier transform infrared (FTIR) test results of all dyed samples were excellent in both pre- and post-mordanting methods. There was no significant difference in the results between post- and pre-mordanting fixation methods. However, the results showed that mordant ferrous sulfate had higher K/S value as compared to all other mordants. The dye extracted from marigold flower showed good dyeing efficiency with mordant to excellent colorfastness tests. FTIR results showed that there was no structural change in lyocell fabrics, before and after dyeing processes. Thus, a natural dye extracted from marigold flower has shown good colorfastness properties without damaging its fiber structure.

An eco-friendly dyeing method: bromophenol blue (BPB) applied for dyeing cotton fabrics coated with cationic finishing agents

Poly(hexamethylene biguanide) (PHMB) is a commercially available cationic bactericide which can form stable and water-insoluble blue complex salt with bromophenol blue (BPB) at room temperature. Herein, we reported the feasibility and applicability of BPB for dyeing PHMB-coated fabrics. The colour yield, levelling property, dye uptake, fastness behavior and antimicrobial efficacy of PHMB-coated fabrics were fully investigated by a variety of analytical methods. The controllable blue colour shade depth depended on the concentration of BPB dyebath and the quantities of PHMB coated on the fabrics, and the colour levelness showed good and above rating. The dye uptake was positively proportional to the quantities of PHMB coated on the fabric, but showed negatively correlation to BPB concentration. The colour fastness to rubbing and washing were excellent, excluding anionic detergents washing. Continuous dyeing was found to be feasible at room temperature without any additives simply via replenishing BPB dyebath, hence avoiding dye wastewater discharge, which may provide an eco-friendly and sustainable dyeing method to reduce generation and emission of wastewater in textile industry. Meanwhile, the antibacterial efficacy of PHMB-coated fabrics was slightly compromised after BPB dyeing, but was still satisfactory, particularly against the gram-positive S. aureus.

Effect of the factors affecting high-performance p-aramid fibre dyeing and their optimization

PurposeThis study aims to evaluate the dyeing of the p-aramid fibre with cationic dyes and investigate the effect of dyeing in the protection of the fibre from ultraviolet (UV) light.Design/methodology/approachP-aramid fabric has been dyed with cationic dyes using benzyl alcohol as swelling agent to promote the penetration of dye molecules into the fibre. The fabrics were evaluated against colour strength (K/S) value and colour fastness properties after dyed with cationic dyes using full factorial design. This design was used to study the effect of factors that affect the response variables as well as to study the interactions among the factors on response variable. The bursting strength, scanning electron microscopy analysis and X-ray diffraction analysis of undyed and dyed p-aramid fabric were performed before and after exposure to UV light to investigate the changes in mechanical behaviour.FindingsThe results show that the p-aramid fabric dyed with cationic dyes has good K/S values and good fastness properties. The exposure of undyed p-aramid fabric to UV light causes serious loss in strength over short duration i.e. 40 h. Dyeing of p-aramid fabric enhances the resistance to UV light which reduces the loss in strength.Originality/valueMost of the work is patented and no one has done the process optimization for the industry, so this study offers promising outcomes concerning the dyeing of p-aramid fabric with enhanced shade depth and good colour fastness characteristics.