Hangzhou Ritan Chemical Co., Ltd. was founded in 2009 by two partners who engaged in Chemical Industry for more than 7 years. We are mainly engaged in Dyestuff, H-acid and Optical Brightener. Dyestuff includes: Vat Dyestuff/ Disperse Dyestuff/ Reactive Dyestuff/ Basic Dyestuff. We recommend our Vat Dyestuff Series.