Leather dye is dye that have an affinity for leather and can be used for leather coloring. For leather dye products, acid, medium, direct and basic dyes can be used. The most commonly used dyes for spray coloring are neutral dyes. The dye is required to be slightly soluble in water, and is easily soluble in an organic solvent such as diethyl sulphate, diethyl ether, ethanol or dimethylformamide. It is mainly used for the spray coloring of leather such as pigskin, cowhide and sheepskin.