Properties Of Dyes Research Articles

Efficient adsorption of cationic dyes by a novel honeycomb-like porous hydrogel with ultrahigh mechanical property

The optimization of hydrogel structure is crucial for adsorption capacity, mechanical stability, and reusability. Herein, a chitosan and laponite-XLS co-doped poly(acrylic acid-co-acrylamide) hydrogel (CXAA) with honeycomb-like porous structures is synthesized by cooperative cross-linking of 2-hydroxypropyltrimethyl ammonium chloride chitosan (HACC) and laponite-XLS in reticular frameworks of acrylic acid (AAc) and acrylamide (AM). The CXAA exhibits extraordinary mechanical performances including tough tensile strength (3.36 MPa) and elasticity (2756 %), which facilitates recycling in practical adsorption treatment and broadens potential applications. Since the regular porous structures can fully expose numerous adsorption sites and electronegative natures within polymer materials, CXAA displays efficient and selective adsorption properties for cationic dyes like methylene blue (MB) and malachite green (MG) from mixed pollutants and can reach record-high values (MB = 6886 mg g−1, MG = 11,381 mg g−1) compared with previously reported adsorbents. Therefore, CXAA exhibits promising potential for separating cationic and anionic dyes by their charge disparities. Mechanism studies show that the synergistic effects of HACC, laponite-XLS, and functional groups in monomers promote highly efficient adsorption. Besides, the adsorption capacity of CXAA remains stable even after undergoing five cycles of regeneration. The results confirm that CXAA is a promising adsorbent for effectively removing organic dyes in wastewater.

Comparative characterization and dyeing properties of poly(ethylene terephthalate-co-polyethylene glycol) fibers and poly(ethylene terephthalate) fibers

A comparative characterization of poly(ethylene terephthalate-co-polyethylene glycol) (PCP) fibers was performed using various parameters, including chemical and supramolecular structures, thermal properties, and physical properties. Dynamic scanning calorimetry and X-ray diffraction analyses revealed that PCP exhibits a lower melting point, glass transition temperature, and crystallinity than PET. In terms of tensile properties, PCP exhibited reduced tensile strength but increased elongation at break, indicating enhanced toughness. Dyeing test results demonstrated that PCP fibers are disperse dyeable at lower temperatures and exhibited optimal dyeability at 100 °C, surpassing PET, without compromising leveling properties or color fastness. These findings underscore the potential for energy savings and process streamlining through atmospheric-pressure dyeing.

Computational study of adsorption and photophysical properties of metallophthalocyanine dyes for DSSCs

Computational study of adsorption and photophysical properties of metallophthalocyanine dyes for DSSCs

Chemiluminescent Reaction Induced by Mixing of Fluorescent-Dye-Containing Molecular Organogels with Aqueous Oxidant Solutions.

Chemiluminescence in solution-based systems has been extensively studied for the chemical analysis of biomolecules. However, investigations into the control of chemiluminescence reactions in gel-based systems, which offer flexibility in reaction conditions (such as the softness of the reaction environment), have only recently begun in polymer materials, with limited exploration in low-molecular-weight gelator (LMWG) systems. In this study, we investigated the chemiluminescence behaviors in the gel states using LMWG systems and evaluated their applicability to fluorescent-dye-containing molecular organogel systems/oxidant-containing aqueous systems. Using diethyl succinate organogels composed of 12-hydroxystearic acid as a molecular organogelator, we examined the fluorescent properties of various fluorescent dyes mixed with oxidant aqueous solutions. As the reaction medium transitioned from the solution to the gel state, the emission color and chemiluminescence duration changed significantly, and distinct characteristics were observed, for each dye. This result indicates that the chemiluminescence behavior differs significantly between the solution and gel states. Additionally, visual inspection and dynamic viscoelastic measurements of the mixed fluorescent dye-containing molecular gels and oxidant-containing aqueous solutions confirmed that the chemiluminescence induced by the mixing occurred within the gel phase. Furthermore, the transition from the solution to the gel state may allow for the modulation of the mixing degree, thereby enabling control over the progression of the chemiluminescence reaction.

Bio-coloration and Antibacterial Function of Wool grafted with pomegranate peel polyphenols catalyzed by laccase

With the deterioration of environmental problems and world energy consumption, the improvement of textile dyeing has been paid more and more attention by researchers. The application of natural dyes in the dyeing of wool fabrics had become a research hotspot. However, the main drawback of the application of natural dyes lies in the poor color stability on wool fabrics. Therefore, research on environmentally and economically friendly dyeing processes has gained crucial importance. In this paper, the effect of pomegranate pigment on the functional dyeing of wool fabric under the catalysis of laccase was discussed. The dyeing effect of different methods on wool fabric was compared and the laccase catalytic dyeing process was optimized. Firstly, the properties of pomegranate peel pigment were analyzed by Ultraviolet-visible absorption spectrum (UV-Vis) and Fourier infrared spectroscopy (FTIR). Then the surface morphology and properties of wool fabric were observed by scanning electron microscope (SEM), microscope and FTIR. Lastly the function and stability of dyed wool fabric were tested by color characteristic value, UV resistance, antibacterial property, color fastness and tensile strength. The results showed that better dyeing effect of wool fabric were obtained by dyeing firstly with pomegranate peel and then catalysis with laccase. The optimum process of laccase catalysis was as follows: catalysis time 8 h, laccase dosage 3.3 U, temperature 50℃, pH 5. The results of SEM, FTIR and microscope tests showed that the phenolic compounds in the pigment of pomegranate peel was catalyzed by laccase to form the deepened coloration polymers and the phenolic polymers were finally combined with the wool fabric. Laccase-catalyzed dyed wool fabric showed good performance stability, such as color fastness to rubbing and soap-washing, strong antibacterial property, great enhancement of UV resistance and excellent tensile strength. The application of laccase in the natural dyeing process of textiles can provide a better way to improve the dyeing properties.

Quinoline and cholesterol based organogelator for selective adsorption of cationic dyes

A novel quinoline and cholesterol based organogelator G1 has been successfully synthesized and characterized. G1 could form stable organogels in ethanol, n-propanol, n-butanol, isobutanol, acetone and ethyl acetate (EA), and the concentration-dependent 1HNMR revealed that hydrogen bonding, π-π stacking and van der Walls interaction were the main driving force to form organogels via the self-assembly of G1. Furthermore, the G1-EA gel realized selective adsorption properties for cationic dyes, such as malachite green (MG), brilliant green (BG), rhodamine B (RB) and crystal violet (CV). The results revealed that at pH = 9.90, c0 = 18 mg·L−1, the adsorption process of G1-EA gel for MG reached equilibrium in 7 h, and the removal rate was 99.13 %. The selective adsorption experiments of the G1-EA gel indicated that the cationic dyes (MG and BG) were efficiently adsorbed out of the mixed dyes solutions. Also, the adsorption isotherm and the adsorption kinetics for the adsorption process were investigated, the results suggested that the Freundlich equation and the quasi-second-order kinetic model were more appropriate to describe the adsorption process.

Optimizing dyeing parameters for sustainable wool dyeing using quinoa plant components with antibacterial properties

This study focuses on the sustainable utilization of Quinoa plant components, particularly its leaves, as a waste agricultural material for natural dyeing applications. Two distinct Quinoa genotypes, Titicaca and Giza, were selected for their natural dyeing properties. UV-VIS absorption spectra of Quinoa colorant extracts provided insights into their chemical composition, revealing distinctive peaks indicative of betalains (400–450 nm), chlorophyll (600–650 nm), carotenoids (400–500 nm), and aromatic amino acids (250–280 nm). Wool samples dyed with different plant parts such as flowers, leaves, and stalks exhibited distinct yellow hue, with leaves demonstrating the highest color strength. Metal mordants such as iron (II) sulphate, copper sulphate, and tin (II) chloride influenced color outcomes, highlighting their role in tailoring final appearance. Fastness properties of dyed wool samples were evaluated, with leaves showing moderate staining resistance and good light fastness. Additionally, antibacterial properties of leaves of Giza Quinoa variety were assessed, showing promising activity against Staphylococcus aureus. The antibacterial properties of fabrics dyed with the leaf extract by mordanting method with different metal salt mordants, particularly Fe, Cr, and Cu, exhibited significant enhancement. These results highlight the multifaceted benefits of Quinoa plant components in sustainable natural dyeing and textile applications, emphasizing their potential for eco-friendly practices in the textile industry.

Bioprospecting Hypoxylon fendleri for pigment production and assessment of its dyeing efficacy on silk fabric

Fungal dyes are promising natural source of pigment for the textile industry due to their environmentally friendly production process. The present study evaluated the efficacy of buffy brown pigment extracted from Hypoxylon fendleri for dyeing silk fabric following fungal identification using morphological features coupled with sequence analysis of the internal transcribed spacer region. The physiochemical parameters namely, pH, temperature, and incubation time along with glucose and peptone concentrations were optimized for in vitro pigment production using the desirability function. A pH of 7 at 28 °C temperature, 75 g/L glucose and 10 g/L peptone with an incubation time of 17 d was found to be optimum with a desirability value of 0.56. The chromatic properties of the dyed fabric were characterized on the basis of CIELAB coordinates. The fastness of color produced on silk fabric was assessed using standard tests for washing, perspiration, and rubbing fastness. Finally, the dye (pigmented liquid extract) obtained from H. fendleri showed good and uniform dyeing properties on silk fabric and could be an alternative natural source for dyeing silk fabric. Moreover, the use of natural dyes will aid in mitigating the hazardous environmental impacts of the synthetic dyeing industry.

All-cellulose composite yarn via welding engineering

Due to the wide range of available raw materials and excellent biocompatibility, all-cellulose composites (ACCs) have received significant attention as a kind of renewable and biodegradable candidate to replace petroleum-based synthetic polymers. However, most current research of ACCs is limited to film and bulk materials. Herein, we present a simple, efficient, and scalable welding method for obtaining green, self-reinforced, high performance all-cellulose composite yarns by partially dissolving and regenerating cellulose yarns with phosphoric acid. The in-situ core-shell structure of the welded yarn results in improved strength (134.6 MPa), friction resistance (8000 cycles), moisture regain (11.89 %), and dyeing properties. Moreover, the regeneration and drying procedure can be optimized to further enhance the strength (190.5 MPa) of the welded yarn. This straightforward welding approach provides a promising and convenient route for manufacturing high-performance bio-based yarn.

Synthesis and Characterization of New Azo Dye Derived from Sulfamethaxolevia Diazonium Reaction and Study its Abilityas an Acid-base Indicator

Background: Most azo dyes are synthesized by diazotization of a primary amine, followed by conjugation with one or more electron-rich nucleophiles. Objective: This study presents the synthesis of a new azocompound by converting sulfamethoxazole to a diazonium salt. Methods: via reaction with hydrochloric acid and sodium nitrite at temperatures between 0 and 5 °C, the resulting salt is then coupled with a 4-methoxyphenol reagent in alkaline medium at the above temperatures to produce an azodye given the IUPAC name of (4-((2-hydroxy-5-methoxyphenyl)diazenyl)-N-(5-methylisoxazol-3yl)benzenesulfonamide). The azo dye precipitate was purified by crystallization methods using a solvent mixture of ethanol water. Characterization was done using different analytical methods such as IR, UV-Vis and H1-NMR in addition to measurements of physical properties. Results: The reddish-pink azo compound gave a maximum absorbance of 495 nm. Acid-base titrimetric analysis was conducted to examine the chemical indicator properties of the azo dye. Clear color differences were obtained between two spaces in the pH range 2-12, where a reddishpink color was obtained in the basic medium and a yellow color in the acidic medium. Conclusions: A new azo dye successfully presented its properties as an indicator.

The Effect of Conjugated Nitrile Structures as Acceptor Moieties on the Photovoltaic Properties of Dye-Sensitized Solar Cells: DFT and TD-DFT Investigation.

A major challenge in improving the overall efficiency of dye-sensitized solar cells is improving the optoelectronic properties of small molecule acceptors. This work primarily investigated the effects of conjugation in nitriles incorporated as acceptor moieties into a newly designed series of D-A-A dyes. Density functional theory was employed to specifically study how single-double and single-triple conjugation in nitriles alters the optical and electronic properties of these dyes. The Cy-4c dye with a highly conjugated nitrile unit attained the smallest band gap (1.80 eV), even smaller than that of the strong cyanacrylic anchor group (2.07 eV). The dyes lacking conjugation in nitrile groups did not contribute to the LUMO, while LUMOs extended from donors to conjugated nitrile components, facilitating intramolecular charge transfer and causing a strong bind to the film surface. Density of state analysis revealed a considerable impact of conjugated nitrile on the electronic properties of dyes through an effective contribution in the LUMO, exceeding the role of the well-known strong 2,1,3-benzothiadiazole acceptor unit. The excited state properties and the absorption spectra were investigated using time-dependent density functional theory (TD-DFT). Conjugation in the nitrile unit caused the absorption band to broaden, strengthen, and shift toward the near-infrared region. The proposed dyes also showed optimum photovoltaic properties; all dyes possess high light-harvesting efficiency (LHE) values, specifically 96% for the dyes Cy-3b and Cy-4c, which had the most conjugated nitrile moieties. The dyes with higher degrees of conjugation had longer excitation lifetime values, which promote charge transfer by causing steady charge recombination at the interface. These findings may provide new insights into the structure of conjugated nitriles and their function as acceptor moieties in DSSCS, which may lead to the development of extremely effective photosensitizers for solar cells.

Literature review on artificial intelligence in dyeing and finishing processes

The finishing process in the textile sector is recognized as one of the most complex. This complexity arises from the diversity of structures, the multiple steps involved, the use of complex machinery, the variety of materials, chemicals and dyes, and the need to combine creativity and precision. Therefore, it is crucial to have tools that can improve efficiency, flexibility, and decision-making in this complex area. This literature review aims to provide relevant information on the use of digital engineering in the field of textile finishing. In this review, we used a systematic literature review methodology to examine how digital engineering is applied in the dyeing and finishing process. The data for this study was collected from reputed databases such as Science Direct, IEEE Xplore, Textile Research Journal and Google Scholar. We used the Prisma framework to select relevant articles, which led to the exclusive inclusion of journal articles in our literature review. A comprehensive framework has been developed to understand the impacts of using digital engineering. The approach presented in this framework provides a comprehensive and highly effective approach to addressing the complex challenges associated with ambiguity, modifications and subtleties frequently observed in the ennobling process. The results of various studies explored different aspects, such as properties of textile materials, chemicals and dyes, performance of finishing machines, organizational performance of finishing companies, as well as health concerns and safety at work. Although these studies have provided valuable solutions, they unfortunately remain insufficient to meet the requirements of the finishing process, which remains a complex area characterized by uncertainties, variations, and subtleties inherent to the practice. This particularity of each dyed and finished product promotes an environment conducive to experimentation and continued research.

Enhanced quantum efficiency of dicyano BODIPYs over difluoro BODIPYs: A DFT approach

The modified BODIPY (pyrromethene) dyes with cyano (-CN), substituting usual fluorine (-F), at the 4-position may give enhanced photochemical stability and quantum yield of fluorescence (QYF) when compared to the corresponding fluoro derivative. We have investigated and discussed comparatively the structural parameters of the ground (S0) and excited (S1) state geometries of a few widely used BODIPY dyes, both 4-cyano and 4-fluoro pyrromethene (PM), through DFT and TD-DFT studies and established the reasons for improved QYF of the cyano derivatives. The electrophilicity index indicates the stability of the excited geometry of the cyanated BODIPY and the calculated transition dipole moments reveal a longer lifetime of the excited state (S1) for the cyano BODIPY. The higher singlet and triplet gap in cyanated BODIPY accounts for higher QYF due to restricted transition from singlet to triplet state. This suggests that a population inversion, crucial for laser action, is easier to build up for cyano derivative than for the commonly used fluoro analogue while other gain/loss parameters of the PM dye lasers remain similar. Hence, 4-cyano derivatives of the PM dyes may be useful for more efficient lasing applications. The non-linear optical properties of the PM dyes are also investigated.

Activated Carbon Prepared from Waste Coffee Grounds: Characterization and Adsorption Properties of Dyes.

Spent coffee grounds (SCGs) have great potential as a useful, value-added biological material. In this context, activated carbon (AC) was prepared from SCGs by an activation process using H3PO4 at 600 °C in the air and used as an adsorbent for the azo dye AO7, a model molecule for dye colorants found in textile industry effluents. X-ray diffraction, SEM and BET revealed that the AC was predominantly amorphous, consisting of a powder of 20-100 µm particles with mesopores averaging 5.5 nm in pore size. Adsorption kinetics followed a pseudo-second-order law, while the Langmuir model best fitted the experimental isotherm data (maximum capacity of 119.5 mg AO7 per AC g). The thermodynamic parameters revealed that adsorption was endothermic and spontaneous. All the characterizations indicated that adsorption occurred by physisorption via mainly π-π interactions. The best experimental removal efficiency optimized by means of a Box-Behnken design and response surface methodology was 98% for an initial AO7 concentration of 20 mg·L-1 at pH 7.5 with a dose of 0.285 g·L-1 of AC and a contact time of 40 min. These results clearly show that activated carbon prepared from SCGs can be a useful material for efficiently removing organic matter from aqueous solutions.

The dyeing properties of alginate/lyocell blended fabric with reactive dyes

The difficulties in dyeing have significantly limited the application of alginate fibers in the field of textile industry. This study aimed to provide a dyeing method suitable for alginate fibers with reactive dyes. The results showed that alginate fibers could be successfully dyed with Reactive Red 195, Reactive Blue 19, and Reactive Yellow 145. Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectrometer (FTIR), and fiber strength were investigated and found that dyed alginate fibers can keep their original structure and physical properties well. Colorfastness was also evaluated, which proved that dyed alginate fibers could maintain their color after soap washing, rubbing, and solarization to some extent. In order to further explore the applicability of the dyeing method, alginate fibers and lyocell were blended at 20/80 ratio to make yarns, knitted into weft plain fabrics, and carried out in the same way. The leveling property of dyed blended fabrics was good, for there was almost no color difference in naked eye observation. The washing and light fastness of blended fabrics were excellent, up to 4–5, while the rubbing fastness was slightly poor due to the fibrination of lyocell possibly. The weight loss rate of alginate fibers was less than 5%, which once again confirmed the dyeing method has less damage to alginate fibers. In addition, tensile strength of dyed blended fabrics was improved. This study can provide a new reference for alginate fiber dyeing.

Functional Technical Textile-Based Polymer Nanocomposites with Adsorbent Properties of Toxins and Dyes also Have Antibacterial Behavior.

This is the first study of non-woven fabrics elaborated by melt-blowing from polymer nanocomposites made of Nylon 6 and nanoclay (Cloisite 20A) modified with an amine (1,4 diaminobutane dihydrochloride). Morphological and physical characteristics, adsorption capacity, and antibacterial properties are presented. From the X-ray diffraction (XRD) results, it was possible to observe a displacement of the signals to other 2θ angles, due to an α to ϒ phase shift. The scanning electron microscopy (SEM) images showed that the mean diameter of fiber decreased as the content of nanoclay increased. The mechanical tests showed that the tear strength force of neat nylon was 1.734 N, but this characteristic increased to 2.135 N for the sample with 0.5% modified nanoclay. The inulin adsorption efficiency of the Nylon 6/C20A 1.5% and Nylon 6/C20A 2% samples at 15 min was 75 and 74%, respectively. The adsorption capacity of Nylon 6/C20A 1.5% and Nylon 6/C20A 2% for methylene blue and methyl orange remained above 90% even after four adsorption cycles. In addition, non-woven fabrics present antibacterial activity against E. coli.

Theoretical, structural, and electronic analyses of pyridin-based dyes for dye-sensitized solar cells applications.

The new series of donor-π-acceptor dyes have been designed using pyridine derivatives as a donor group and thienothiophene as a π-spacer group, which were linked via 10acceptor groups. The highest occupied molecular orbital energies range from - 6.177 to - 5.786eV, whereas the lowest unoccupied molecular orbital energies range from - 2.181 to - 3.664eV. A6 dye has smaller energy gap, lower hardness, higher electrophilicity index, and good photovoltaic performance than other sensitizers. The lowest dihedral angle is observed in A1, A2, A6, A7, and A8 which are appropriate for intramolecular charge transfer between the molecules. The A8 has higher light harvesting efficiency, which increases the photovoltaic efficiency of the designed dye. The A6, A7, and A8 dyes spend less time in the excited state, which means they emit photons more efficiently than other dyes. The interaction between donor to π-spacer (red line) parts of the dyes has the bonding interaction (positive), and π-spacer to acceptor (blue line) parts of the dyes have the bonding and antibonding (negative) behaviours. The dyes A5 and A9 have 305.79 and 357.71 times higher β0 values than urea (0.781 × 10-30 esu) molecules. The spectral properties of the A6 dye strongly affect the structural modification. The density functional theory (DFT) and time-dependent DFT (TD-DFT) approach B3LYP/6-311G (d,p) basic set were used to optimize the designed dyes. All the calculations are performed using Gauss view 6.0 and Gaussian 09 software. The density of state spectrum is plotted using Gauss sum 2.6.

Research of the Dyeing Properties of Lychee Leaves and Sappan Wood Extract on Silk-Linen Fabric

Synthetic dyes are the primary colouring materials for textile dyeing; however, the residual industrial wastewater from the dyeing process contains complex concentrations of chemical substances, which result in toxicity and environmental pollution with severe negative impacts on ecology and health. This study adopts an eco-friendly perspective, utilizing a mixture of lychee leaves and sappan wood extracts for dyeing silk-linen fabrics. It explores the impacts of dyeing time, mordants, and dyeing methods on the colour quality of the samples. A computer colourimeter was used to compare the colour effects of different dye solution ratios on silk-linen fabrics, and the colour fastness to water, perspiration, and dry rubbing of the dyed fabrics was tested. The results show that the optimized dyeing process for silk-linen fabrics using a mixed solution of lychee leaves and sappan wood includes the following findings: Dyeing time has no significant impact on the CLE L*, a*, and b* values. The highest L* value and colour brightness are achieved under conditions without mordants. By mixing dye solutions in different proportions and treating them with mordants, the colour gamut of silk-linen fabrics has been expanded. The dyed colours are similar to the main popular colours of 2024, making them the trend colours of this year; the samples' fastness performance tests indicate that the colour fastness to water, perspiration, and dry rubbing essentially meets the requirements for textile fabrics. The use of lychee leaves and sappan wood for fabric dyeing is not only environmentally friendly but also possesses significant health-beneficial properties, offering potential commercial value.

Post-synthetic modification of near-infrared absorbing cyclodextrin-encapsulated cyanine dyes for controlling absorption wavelength, stability, and singlet oxygen generation

Abstract In this study, near-infrared absorbing rotaxane-type cyanine dyes exhibit high tolerance to various chemical reactions, which is attributed to the encapsulation effect of their cyclic molecules. As a result, rotaxane dyes can be post-modified on the host α-cyclodextrin or guest cyanine skeleton to adjust their solubility, absorption wavelength, stability, and singlet oxygen generation ability. The guest modification product obtained via the Heck reaction demonstrates a red shift of its absorption wavelength owing to the extended conjugation system. Moreover, the products of host modification through the methylation and benzylation of all cyclodextrin hydroxyl groups not only become lipophilic and show extended absorption, but also exhibit higher photooxidation tolerance, lower singlet oxygen generation rate, and increased singlet oxygen tolerance, indicating their potential applicability as highly durable dyes. Furthermore, the outstanding singlet oxygen tolerance of these dyes enables their use in long-life singlet oxygen generators, in which the total amount of singlet oxygen increases. This work demonstrates that an intrinsically unstable near-infrared cyanine dye can be used as a synthetic intermediate by stabilizing it via α-cyclodextrin encapsulation, allowing the post-modification of various properties of cyanine dyes toward the higher-order near-infrared-absorbing materials with complex functionalities and diverse utilities.

Key features of blend denim fabrics performance with dyed weft silk yarn and different weave structures

This research aimed to weave the warp indigo-dyed cotton yarn with un-dyed or dyed silk yarn and analyze the impact of different weft yarn structures on the properties of denim fabrics. The dyed silk yarn was performed by a selection of different anionic indigo and non-indigo blue dyestuffs. The dyeing shades of the anionic Indigo Carmine dye on silk exhibited high build-up at the acidic pH range 2–2.5 with poor washing fastness and even so, the cationic aftertreatment of the dyed silk samples showed un-matched color with indigo-dyed cotton yarns. The dyeing properties of two commercial non-indigo reactive and acid dyes on silk add other advantages. To ascertain the dyeing shades evaluation of the non-indigo dyes on silk, two sets of blended denim fabrics were investigated. The first set included a weft-wise silk yarn dyed with reactive dye RB 5, and the second set included silk yarns dyed with acid dye AB 193. Weaving of the blended fabrics was carried out in Twill 3/1, 3/2 Z,and Satin 53 patterns and exhibited significant color effects of the dyed silk yarns to those of the un-dyed control samples. The dyeing shades of the non-indigo RB 5 and AB 193 dyed weft-wise silk yarns were found to be matched in color performance with the conventionally indigo- dyed cotton yarns. Ultraviolet resistance of the blend denim fabrics was evaluated, showing significant improvement in UPF of the weft-wise dyed silk. The study claimed that the dyed silk yarns a good candidate for newly developed blend denim fabrics.