Vat pink R is a thioindigo dye. The main method for obtaining thioindigo dyes is to oxidize unsubstituted or substituted benzo[b]thiophene-3 or naphtho[2,3-b]thiophene, and use various oxidants. Such as bromine in chlorosulfonic acid medium, polysulfides, oxygen in the presence of copper salts, etc. Reductive pink R is used for dyeing cotton, viscose, silk, wool, nylon, vinylon and printing cotton. Good levelness, medium affinity, bright color, pure Chemicalbook bright, can be used alone, can also be combined with reduced red GGN, reduced brown RRD, reduced red green lotus RH and other colors. It is also used in the manufacture of organic pigments, plastic coloring, etc.