Nature of the acid-dyeing process

Abstract

The complexity of dyeing processes has given rise to many theories, all of which may be classified under the general headings of chemical or physical. However, the more recent work of El6d [1] ,2 Porai- Koschitz [2], Speakman l3j, and their collaborators leaves little doubt that the reaction of wool with acid dyes is governed by chemical laws and consists in the neutralization of the basic groups in the fiber by the acidic groups of the dye molecules. The data in the present report, obtained by a somewhat different approach to the problem, constitute further evidence in favor of the chemical theory for this type of dyeing.