PROCESS FOR DYEING AND PRINTING WITH SULPHUR DYES AND FOR PREPARING SULPHUR DYE PREPARATIONS READY FOR USE, AND SULPHUR DYE PREPARATIONS PREPARED ACCORDINLGY

摘要

Dyeing and printing with sulfur dyestuffs involves dissolving the dyestuff by reduction. The dissolved reduced dyestuff is applied to the material to be dyed or printed and the dyestuff is reconverted into in soluble dyestuff by oxidation. The present invention improves the prior art by using as the dyestuff reducing agent a compound of the formula IMAGE or an alkali metal salt thereof, wherein R is -H or -OH and R' is -H, -CH3 or -CH2OH.