Dyeing of silk - Part 2

摘要

As stated earlier acid and metal complex dyes are the most favoured class of dyes used for the dyeing and printing of silk. The technology of dyeing silk is explained as follows. In acid solutions pH of 4-6 the silk fibroin takes on a positive charge. The resulting electric charge is neutralised by a negative charge coming from the dye molecules. The coloured anions of the dyes present in the dyebath serve this function. Most of the dyeings take place around pH5. At this pH level very level dyeing occurs.