Dye-Fibre Bond Stabilities of Some Reactive Dyes on Silk

Silk was dyed with twelve reactive dyes containing various reactive groups. The dyeings were thoroughly extracted so that all non-covalently bonded dye was removed. The extracted dyeings were treated with buffer solutions in the pH range 1.89 to 10.65 at 70 °C for 24 h. The exhaustion, fixation ratio and extent of reaction of the dyeings and the rate of hydrolysis of all dyed samples in six buffers were measured