... 4)Timely delivery I. We are manufacturer of chromium hemitrioxide,chromic oxide,oxide of chromium and many other chemical materials. II ... . chromium hemitrioxide,chromic oxide,oxide of chromium,our advantage:(1)Factory direct supply ... 4)Timely delivery(5)Many spefications. III. chromium hemitrioxide,chromic oxide,oxide of chromium usage:It is mainly used in ...