Potassium Metabisulphite: Food grade Potassium Meta Bisulphite is widely used as food preservative. It is also used as preservative in vegetables and fruit, pickles, potato chips, namkins, all fried snacks etc. It is also used in wine and Beer & wine industry. It is widely used in cottage industry as food preservative as it doesn’t have any taste and is better compared to sodium salts. The general dose of PMBS in food industry is 0.3mg to 0.7 mg per kg of food item.