Method for preparing aqueous solutions of reduced sulfur dyes with high concentration in coloring, including the derivatives derived by tionation of indofenols, including those of carbazol and betanaftilamine and their products. (Machine-translation by Google Translate, not legally binding)

摘要

"METHOD FOR THE PREPARATION OF AQUEOUS SOLUTIONS OF REDUCED SULFUR DYES WITH HIGH CONCENTRATION IN COLORING, INCLUDING THE DERIVATIVES DERIVED FROM INDOFENOLES, INCLUDING THOSE OF CARBAZOL AND BETANAFTILAMINE AND THEIR REDUCTION PRODUCTS", which is characterized by treating sulfur dyes in an aqueous medium with reducing agents alkaline, whose reducing agents contain sulfur in its molecule in whose aqueous-reducing medium, a small and effective amount of solubilizing agent has been dissolved, thanks to which the amount of reduced dye that passes in solution is very significantly increased and it is prevented from form in the same precipitates and condensed breosos. (Machine-translation by Google Translate, not legally binding)