![]() ![]() Because at low temperature direct dyes will exhaust on the cellulose and at low temperature direct dye have no affinity of wool/silk. Fig: Union Dyeingĭyeing the cotton fibers, leaving the wool/silk fibers white:ĭirect dye is used for this dyeing process. After dyeing the materials need to be washing well to remove the acid. For this process acetic or formic acid is use to instead of sulphuric acid to protect the cellulose. So it is very easy to dyeing the wool/silk in union without staining the cellulose. Because, acid dye have no affinity of cotton fibers. In this purpose generally acid dye is used to complete union dyeing process. Union Dyeing Techniques of Protein and Cellulosic Fibers:ĭyeing the wool/silk fibers, leaving the cotton fibers white:
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