Application of Terminalia chebula natural dye on wool fiber—evaluation of color and fastness properties

Abstract

In the present study, Terminalia chebula (Myrobalan/Harda) natural dye extract was used for the development of eco-friendly shades on woolen yarn with different hues and tones. The effect of dye concentration on color strength (K/S) of woolen yarn dyed with T. chebula was assessed. Increasing the concentration of dye decreased lightness (L*) values of woolen yarn samples, indicating darker shades. Different metal salts such as alum, ferrous sulfate, and stannous chloride were used to enhance the fastness properties (light, wash, dry and wet rubs) of dyed woolen yarn. Pre-treatment of woolen yarn samples with metal salts has shown encouraging results with better fastness properties and enhanced color strength values. Five percent ferrous sulfate mordanted samples show greater saturation with increasing dye concentration from 0.5 to 15 % (o.w.f.). Fourier-transform infrared (FT-IR) analysis of T. chebula dye extract shows presence of carbonyl and hydroxyl functionalities.

Extraction of Carotenoid Colorants from Tagetes erecta (Marigold) Flowers and Application on Textile Substrate for Coloration

“…Alum and tin mordanted dyed shade's color coordinates are observed shifted towards more yellow region owing to the brightening property of alum and tin mordant in comparison to un-mordanted dyed wool samples. While iron mordant shifted a* and b* plot towards red region owing to the darkening effect of iron mordant [3]. Tin mordanted dyed wool samples are found more shifted in comparison to alum.…”

“…Metal mordants (alum, iron and tin) individually or in combinations affected the color strength appreciably with the effect of dye concentration [16]. Iron salts increased the color strength values quite high owing to strong binding affinity towards dye molecules and wool fibers via coordination complexation and thus produced deeper shades on fiber [3,17]. Alum mordant, having low tendency for complexation, decreased the color strength and lighter shades are obtained.…”

“…The T. erecta dyed woolen yarn (un-mordanted as well as mordanted) showed wash fastness results in good to excellent rating (3)(4)(5) and negligible staining on adjacent fabrics (cotton and wool). A little adverse effect of mixed mordants for wash fastness results was observed.…”

“…Dyeing of textiles and textile substrates has been known since ancient times. There have been a lot of trends about dyes; natural dyes used in the beginning and synthetic dyes overtook the space in 19 th century on grounds of a long range of shades, good fastness and economically affordability [1][2][3]. Now due to the increased awareness about natural products, use of eco-friendly products has been increased worldwide.…”

Sustainable Utilization of Ultrasonic Radiation in Extraction and Dyeing of Wool Fabric Using Logwood (Haematoxylum Campechianum) Extracts

“…After the discovery of chemical dyes by "Perkin" chemical dyes have completely replaced the usage of natural dyes for coloring purpose (1,2). Due to the awareness of the ecological and other health problems that are associated with production and frequent usage of chemical dyes in different fields, a worldwide attention to textile industry for the use of natural dyes rather than chemical dyeshas emerged (3,4). In recent years, the use of natural dyes has gained a mildermomentum due to increased utilization of natural dyes in various fields such as cosmetic, food product, pharmaceutical and in the textile industry as well (5,6).…”