Vat dyes are a class of dyes that are named such as a result of the technique by which they are connected. Tank coloring is a procedure that alludes to coloring that happens in a pail or tank. Any color, including fiber-responsive colors, coordinate colors, and corrosive colors, can be utilized in a tank color. Cotton, fleece, cowhide and different strands can be altogether colored with tank colors. The first tank color is indigo, once acquired from plants however currently delivered artificially.