Acid blend is a mixture of tartaric, malic, and citric acids that is commonly used in winemaking to adjust acidity, enhance flavor, and improve mouthfeel. It is a versatile product that can be used at any stage of the winemaking process, from crushing to bottling.
 
Tartaric acid is the primary acid found in grapes and is responsible for the crispness, freshness, and balance of wine. Malic acid is a tart acid that gives young wines their green apple flavor. As wine ages, malic acid naturally breaks down into softer lactic acid. Citric acid is a mild acid that is often used to acidify white wines.