Engichem Specialities Pvt. Ltd. Supplies Tannin Stain Inhibitors. Engichem Specialities Pvt. Ltd. Offers chemical raw material, intermediates and special chemicals. Tannin Stain Inhibitors are dry pigments and liquid additives formulated into paint and coatings. Tannin Stain Inhibitors are applicable to stop the discoloration of a painted wood surface due to the migration of water-soluble tannic acids. These pigments are used for corrosion resistant and tannin stain resistant coatings. These pigments are also provided with the features of chromate free.