why is dying process of the Silk considered to be risky to a labourer
Answers
Silk is dyed using various dyes such as Acid dyes, metal-complex, reactive dyes etc. Acid dyes are more suitable for silk and wool, and the direct and vat dyes are more suitable for cotton and so on. Dyeing and printing makes it possible to bring about the choicest colours and shades on silk leading to value addition of the silk materials. Silk offers a wide colouration possibility covering almost the entire spectrum of colours and hues due to its ready acceptability for a large range of dyestuffs. The exceptional capacity to absorb moisture from the air, the comparatively simple and orderly arrangement of fibroin molecular structure, and the abundance of hydrogen bonds and electrostatic bonds render silk fibre an ideally suited substrate with a very good dye affinity. Anionic dyestuffs namely acid and direct dyes form a 'Dye-Fibre' complex by electrostatic and hydrogen bonds. Silk can also be dyed with basic, metal-complex and reactive dyes. Acid dyes are widely used for dyeing of silk. Using this class of dyestuff, a wide range of bright shades can be obtained. These dyes are sodium salts of organic acids (mostly sulphonic acid) and are applied from acidic medium.