Potassium acid tartrate
Potassium bitartrate is an organic potassium salt of L-tartaric acid. It is a by-product of winemaking and occurs naturally in grapes, the major fruit used to produce wine. It has a role as a food anticaking agent, a laxative, a plant metabolite, an antimicrobial agent, a raising agent, a food acidity regulator, a food humectant and a food stabiliser. It contains a L-tartrate(1-).