Riwa cooperation is a large pigment manufacturer,hangzhou riwa chemicals co.,ltd., hangzhou rongcai industry co.ltd., and hangzhou riwa chemical co.,ltd.,belong to riwa cooperation,riwa manufacture and sell specially pigment red,orange,yellow,green,violet,blue and all kinds of pigment and chemical intermediates,our brand have riwa,rwcolor & hangcolor,all of these products are widely used in ink,paint,coating,plastic,rubber,pigment printing,paste,arts pigment and stationery etc. relevant field. riwa was established in 1987, top quality, competitive price and perfect servic are our tenet,riwa has a strong team on manufacturing, dealing in, researching and developping. the producting capacity is over ten thousand tons per year, 80% of our products are exported to europe,america,asia,africa,etc.60 countries.riwa has perfect testing instruments, strict supervision and quality control. she has gotten the high reputation in the field.riwa is located in national grades manufacture base, hangzhou jiangdong industrial zone, welcome warmly friends from all over the world to visit and negotiate.lets cooperate closely and make a colorful world.