Hi ,here Amber from Changsha Weichuang Chemical ltd, who are manufacturer of sodium metabisulfite, sodium thiosulfate, sodium sulfite and ferrous carbonate with 500 workers in factory, exported 4000mt goods total to more than 20 countries every month ,we kept good business and got many reorders . Do you need some of them ? Freely contact me amberatweichuangchem.com Show More