Being just one of the numerous varieties of water-insoluble dyes, this dye has transformed the fabric industry with its coloring capacities. The color is used to color the fiber just after transforming it to leuco kind in an alkaline option of sodium hydrosulfite. These dyes are categorized into 4 categories depending upon the degree and amount of temperature, salt, caustic soda and hydrosulfite are required.

Chromogenic products change their optical residential or commercial properties in reaction to an exterior stimulus. Thermochromic is the residential or commercial property in which shade change with the changes in temperature level, Halochromic are those products which transform their color when pH change. The type is Leuco Halochromic (in the form of microcapsules.) Thus, it is a combination of thermo and Halo chromogenic pigments.