The reducing agent of the Soluble Vat Dyes is Na2S2O4. These are provided in different colors at us. Basically, these are the naturally coloring substances, provided with easy solubility. It allows for various efficient coloring process in different industries. Soluble Vat Dyes are totally different from reactive as well as disperse dyes and can be used in all alkaline conditions. This is suited for the dyeing both man-made and natural fibers and materials.