Potassium metabisulfite, K2S2O5, also known as potassium pyrosulfite, is a white crystalline powder with a pungent sulfur odour.
P 2367 (OTTO) Potassium metabisulphite, GR 98%+ Cas 16731-55-8 - used in the textile industry for dyeing and cotton printing. P 2367 (OTTO) Potassium metabisulphite, GR 98%+ Cas 16731-55-8 - used in tint etching iron-based metal samples for microstructural analysis.