Bleach agent (e.g.candies, cake, bamboo shoots, etc);Loose agent (e.g.bread, cracker etc);Antiseptic and germicide (e.g.fruit juice, tinned food ,brews, the cereals food is defended storage etc);Inhibitor and freshen agent.(e.g.day lily, seafood, fruit and vegetable etc)
http://www.chinafooding.com/Potassium_Metabisulfite
PR