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The colorless (white) sulfur smelling powder (also potassium metabisulfite, potassium bisulfite or KPS for short) is the potassium salt of sulphurous acid, Under acidic conditions, the compound becomes sulfur dioxide split off (there is no effect in pure water). It is mainly used as an antioxidant, preservative and color stabilizer in the food industry (declared by the Code E 224) such as in fruit juices. KPS is also used in winemaking sulphurize used by mash, must or wine. The potassium introduced promotes the failure of Weinstein, Furthermore, it will also be shared with tartaric acid dissolved in water (see above) for so-called wet preservation used by barrels or containers.

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