THE EFFECTS OF DYEING ON THE PERMANENT SET OF THE WOOL FIBRES

(II) THE EFFECTS OF THE ACID MORDANT DYES

Abstract

The effect of the mordant-dyeing upon the set-abilities of the wool fibers was examined; Neolan Brown GRM, Chrome Brown RH and Eriochrome Azurol B were used as the dyes.
In the case of Neolan Brown GRM, the set-abilities decreased a little as in the cases of the acid dyes reported previously (Part I). In this experiment the desorption of dyes was not observed during the setting. The effects of Chrome Brown RH and Eriochrome Azurol B were more remarkable than that of Neolan Brown GRM, but the effect is supposed to be negligibly slight in the concentration ranges of dyes and mordants used commercially.
As the mordant Cr₂(SO₄)₃ was also examined instead of K₂Cr₂O₇, but its effect is remarkably inferior to the latters.