CATIONIC DYE AND CONVERSION OF HARDLY SOLUBLE INORGANIC SALT OF WHITENING AGENT TO READILY SOLUBLE ORGANIC SALT

摘要

A process is described for converting sparingly soluble inorganic salts of cationic dyes and brighteners into more soluble salts of organic acids without intermediate isolation of the free base, wherein the counter-ion of the dye or brightener cation is replaced by the anion of a cyclic or acyclic organic acid by means of Donnan dialysis. Dye or brightener solutions obtained in this way are stable and can be directly used for dyeing or printing textile materials.