![]() Because basic color have no affinity of wool at low temperature. In this purpose, basic dye is used to complete union dyeing. But it can remove by treatment with ammonia acetate.ĭyeing silk fibers, leaving the wool white: ![]() In this process some color may be adjust on silk surface. In this process acid dye is used and it apply on wool fiber at boiling temperature to produced color. Silk is dyeing with acid and basic dye at low or medium temperature and wool is dyeing with acid and basic dye at high temperature.ĭyeing wool fibers, leaving the silk white: Silk and wool union dyeing process is partial difficult, because only without of temperature question both fibers have same affinity for dye. For this direct dye apply at high temperature and acidic medium. In this purpose direct dye is used to complete unions dyeing same color. Finally we get different color union dyed materials.ĭyeing the cotton and wool/silk fibers by using same color: ![]() In this process, firstly cotton fibers are dyeing by direct dye at low temperature and then wool/silk fibers dyeing by acid dye. There are different process to dyeing the wool/silk and cotton fibers by using different dyes. In this process soda must be used, because it works as a protector for wool/silk fibers dyeing.ĭyeing the cotton and wool/silk fibers by different color: ![]() So it is best to dyeing cotton fibers, to leaving wool/silk white. 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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