Acid Blend This compound is used to raise the acidity of wine, thus increasing tartness. It is comprised of equal amounts of malic, tartaric, and citric acids. Use: Acid blend is most widely used by winemakers who start their wine with fresh fruit; you will not need this chemical if you are making wine from a kit. Its usage varies depending on the acidity of the wine or must. An acid test kit should be used to determine the acidity and usage. One teaspoon of Acid Blend will raise the titratable acid in one gallon of wine by approximately .15%. One Tablespoon of Acid Blend will raise the titratable acid in five gallons of wine by .09%.