Natural products with therapeutic nature are nowadays warmly welcomed in textiles. Current study is concerned with isolation of tannin from neem bark (Azadirachta indica) and its application onto ...silk fabric. For improvement in shades, chemical & bio-mordants have been employed at optimal dyeing conditions. It is found that methanolic extract of pH 5 obtained 8 g dye powder after US Treatment for 30 min has given high color strength if used to dye irradiated silk for 65 min at 75 °C. Bio-mordanting using herbal plants has improved the color characteristics as compared to chemical mordants used. ISO standards for color fastness reveal that herbal based bio-mordants have improved the rating from good to excellent as compared to chemical mordants used. It is concluded that US treatment has not only isolate the colorant for neem bark under mild condition but also given excellent characteristic using bio mordants onto silk fabrics.
The utilization of bio-mordants to make natural coloring process more eco-friendly is gaining worldwide fame, whereas the addition of microwave treatment has added value to the extraction of colorant ...under mild conditions. The Current study has been undertaken to isolate tannin from neem (Azadirachta indica) bark under the impact of microwave radiation for the dyeing of mordanted (chemical and bio) silk fabric. For this purpose, the extraction of colorant (tannin) has been carried out in various media and dyeing variables have been optimized. For making the process more sustainable and clean, extracts ofbio-mordants such as turmeric (Curcuma longa), henna (Lawsonia inermis), pomegranate (Punica granatum) and acacia (Acacia nilotica) have been employed at given conditions. It is found that microwave radiation for 2 min. to acidified methanolic extract of 2 pH obtained from 6 g powder has given good color strength in irradiated silk when it is used to dye at 75°C for 65 min. by employing 3 g/100 mL of Glauber's salt the as exhausting agent. It is concluded that microwave treatment has not only enhanced the extraction of tannin from neem bark but also improved the color characteristics under low conditions.
In the era of the industrial revolution with the increased demand for sustainable products, the use of natural products particularly herbal‐based bio‐colorants in every walk of life is increasing. In ...the current study, cinnamon as a source of natural dye for wool has been explored under the influence of microwave radiations and the application of sustainable bio‐mordants has been done under mild conditions. Microwave radiations for 1–6 min have been used to increase the extraction yield and 1–10 g/100 ml of sustainable chemical and bio‐mordants have been employed to get excellent color characteristics. The utilization of reduced amounts of herbal nature‐based bio‐mordants in comparison with chemical anchors after microwave irradiation of extract and the woolen fabric has not only produced new shades but also improved the color characteristics from good to excellent. It is concluded that the use of microwave treatment as the sustainable tool has excellent potential to isolate the colorant from cinnamon bark under mild conditions; whereas the addition of bio‐mordants has valorized the coloring process greener and more valuable.
Natural dyes have grown in popularity due to their eco-friendliness. They can be used as a substitute for synthetic dyes to minimize environmental pollution. This research investigates the natural ...colouring behaviour of haar singhar flower (HSF) extract in cotton dyeing. Colorant was extracted under various conditions utilizing various extraction mediums such as aqueous, basic, and acidic. On cotton, it was discovered that applying 55 mL of aqueous extract containing 1.5 g/100 mL sodium chloride for 40 minutes at 70 °C yielded the best colour output. A new hue with good colour fastness was developed utilizing chemical and bio-mordants. The existence of nyctanthin as a colouring agent in haar singhar flowers was discovered through FTIR analysis of the extract. The CIE Lab system revealed that using 2 g/100 mL of pistachio shell as a bio-mordant resulted in good quality reddish yellow hues. It was discovered that ultrasonic radiations have a high potential for isolating colourants and dyeing cotton fabric under decreased conditions of temperature, time and volume. The application of biomordants has made the procedure greener, more efficient, and safer.
Environmental friendly products particularly natural dyes are going to be much popular around the globe due to their non-toxic and bio-degradable nature. The current study was planned to enhance the ...dyeability of walnut bark having juglone as a reddish-brown natural dye under ultrasonic radiation as an environment-friendly and green tool After conducting series of experiments, it has been found that wool (RW) and extract (RE) after ultrasonic treatment for 45 min, when dyed for 45 min at 55°C using an acidic bath of 3 pH has given good color strength on the wool fabric. To develop the new shades, sustainable and eco-label chemicals (Fe, Al, and tannic acid) and four bio-mordants such as Acacia bark, Turmeric, Henna, and Pomegranate were also applied at optimum conditions. It is studied that 3% of turmeric extract as pre-bio-mordant and 5% of Acacia extract as post-bio-mordant has given excellent color characteristics as compared to their synthetic. It is concluded that ultrasonic treatment being an eco-friendly tool has a great potential to improve the dyeability of natural reddish-brown dye from walnut bark and the inclusion of sustainable biosources as a color modifier has value-added the natural dyeing process with excellent color ratings.
The recent pandemic scenario has caused demand for green products that have medicinal aspects, as well as greener approaches for global health. Natural dye from plants, particularly from harmal ...seeds, is an excellent alternative to carcinogenic yellow synthetic dyes. The current study has been conducted to isolate natural colorants from harmal seeds in methanolic medium through Gamma-Assisted Extraction (GAE). The dyeing variables that are necessary for shade development before and after mordanting were selected. It has been found that 6 kGy is the optimal absorbed dose for extraction of colorant from 6 g of powder to isolate the colorant in the methanolic medium through the Gamma-irradiated extraction mode (GAE). To get excellent results, 30 mL of methanolic extract containing 6 g/100 mL of Glauber salt was sued for dyeing of irradiated wool at 45 °C for 65 min. For improving the color strength and acceptable rating of fastness, 9% of henna, 3% of acacia, 10% of turmeric, and 7% of pomegranate extracts as pre-bio-mordants as well as 7% of acacia, 3% of pomegranate, 9% of henna, and 10% of turmeric extracts as post-mordants have given high results compared to when chemical mordants have been used. It was concluded that Gamma-ray treatment has excellent color strength in the dyeing of bio-mordanted wool using harmal seed extracts under mild conditions, and has good fastness ratings after using chemical and bio-mordanting methods as well.
In this research work, an attempt has been made to investigate the possibility of wool dyeing with natural dye extracted from the Cinnamomum camphora middle aged/mature leaves. Visually, a range of ...ecofriendly shades with quite different color gamut of varying hue and tone were produced via the application of different natural mordants. The effect of various natural mordants (gallnut, pomegranate peel, arjun bark, chlorophyll extract, and citric acid) and some commonly used metal mordants (ferrous sulfate, copper sulfate, stannous chloride, and sodium dichromate) on color and fastness properties of dyed wool samples was comparatively evaluated in conjunction with 50% (o.w.f.) of C. camphora natural dye. Dyeing experiments were performed with and without mordants employing pre-mordanting technique. The color of dyed wool fibers were investigated in terms of CIELab (L*, a*, and b*) and color strength values (K/S); and fastness properties were determined as per ISO standard test methods. In general, pre-biomordanted wool fibers with P. granatum (3, 4 and 5% o.w.f.), citric acid (5% o.w.f.) and chlorophyll extract (10-50% o.w.f.) showed comparable color and fastness results compared to those of metal treated samples. Durability of color was also checked to assess the effect of washing of dyed wool fibers. This research work on the use of ecofriendly biomordants will provide a valuable reference in future for ecological and environmentally safe dyeing.
The worldwide resurgence of natural dyes in all fields is due to the carcinogenic effects of effluent loads shed by synthetic industries. Coconut coir (
Cocos nucifera
) containing tannin as a source ...of natural colorants has been selected for coloration of bio-mordanted silk under the influence of ultrasonic radiations at various dyeing conditions. For extraction of tannin dye from cocos powder, different media were employed, and dyeing variables such as dyeing time, dye bath pH, dyeing bath temperature, and the effect of salts on dyeing were optimized. For achieving new shades with excellent color characteristics, bio-mordants in comparison with chemical mordants were employed. It has been found that acid-solubilized extract after ultrasonic treatment for 45 min has yielded high color strength, when coconut coir extract of 4 pH from 6g of cocos powder, containing 5g/100mL salt solution as exhaust agent, was used to dye silk at 75°C for 65 min. Among bio-mordants turmeric (
K
/
S
=13.828) and among chemical mordants iron has shown excellent results (
K
/
S
=2.0856). Physiochemical analysis of fabric before and after US treatment shows that there is no change in the chemical structure of the fabric. It is found that ultrasonic waves have excellent potential to isolate the colorant followed by dyeing and environmental friendly mordanting at optimal conditions, but also the usage of herbal-based plant anchors, i.e., bio-mordants, has made the natural dyeing process more sustainable and clean.
Prangos ferulacea (Jashir) plant possesses various phytoconstituents such as coumarins, flavonoids, alkaloids, umbelliferon, and monoterpenes and has been used in traditional medicine. The presence ...of flavonoids in aerial parts of Prangos ferulacea necessities further examination of using them as a source of natural colorants for developing natural and beautiful shades on wool yarns. This will add one more new effective natural dye source and ease the dependency of the present-day textile industry on synthetic colorants. Simple adsorption of aqueous dye extract on the wool followed by evaluation of buildup properties using 28 different binary metal combinations as mordants were studied in this study. The dyeing was performed by exhaust dyeing method and dyed samples were analyzed through reflectance spectroscopy and analyzed in terms of color strength, CIEL*a*b*, and CIEL*c*h
o
values. Color characteristics were evaluated on a spectrophotometer under D65 illuminant and 10° standard observer. FT-IR and SEM analyses were performed to characterize P. ferulacea dyed wool yarns. The results showed that overall 29 different shades having very good to excellent fastness properties were produced by the use of different metallic salt combinations in natural dyeing of wool yarns using aerial parts of P. ferulacea as a source of natural dye.
The present study aims to extract a natural reddish brown colorant from Peepal (
Ficus religiosa
) for silk dyeing using the microwave radiation process (MW). The colorant was isolated in aqueous and ...acidic media, and MW treatment for 1, 2, 3, 4, and 5 min has been given to both fabric and extract to observe changes in color intensity. The dye variables have been optimized, and for sustainable shade making process with good fastness, 1.0–5.0 g/100 mL of sustainable chemical and bio-mordants has been employed. It has been found that after microwave treatment for 3 min, under selected conditions, the irradiated aqueous extract has given high color intensity onto silk fabric. The utilization of 3% of Al, 4% of Fe, and 2% of tannic acid (T.A.) as pre chemical mordant whereas 4% of Al, 4% of Fe, and 3% of tannic acid as post chemical mordant have given good color characteristics. In comparison, 4% of acacia and 3% of turmeric and pomegranate while 3% of acacia and turmeric and 4% of pomegranate extracts as post-bio-mordant have given excellent color characteristics. It is concluded that MW treatment has an excellent sustainable efficacy to isolate colorant from Peepal bark for silk dyeing, whereas the inclusion of bio-mordants has not only made the process more sustainable and environmental friendly but also best K/S, and
L*a*b*
values have been acquired.
