Tetrasodium pyrophosphate (TSPP) is a chemical compound that is commonly used in food processing and as an additive in various products. It is a white, crystalline powder that is soluble in water and has a slightly alkaline pH. TSPP is used in a variety of food products as a chelator, emulsifier, and thickener. It is commonly used in processed meats, seafood, dairy products, and baked goods including marshmallows to improve their texture, stability, and shelf life.