This is a blend of the three primary acids found in fruit. Contains: 50% Citric acid, 25% Malic acid and 25% Tartaric. All in granulated form. Experiments have shown that acid deficient musts in most cases do better when a blend of these acids are added as opposed to just using one of them. Most recipes call for this blend. One teaspoon of Acid Blend will raise the titratable acid in a gallon of wine by approximately .15 per cent tartaric.