The pH of wine is important to determine because it will affect the quality of the final product in terms of taste,color, oxidation, chemical stability, and other factors. Generally in winemaking, the higher the pH reading, thelower the amount of acidity in the wine. Three important factors in determining the pH of wine include theratio of malic acid to tartaric acid, the amount of potassium, and the total amount of acid present.Most wines optimally have a pH between 2.9 and 4.0, with values differing based on the type of wine. Values above pH 4.0indicate that the wine may spoil quickly and be chemically unstable. Lower pH values allow the wine to stay fresher for a longerperiod and retain its original color and flavor. High pH wine is more likely to breed bacteria and become unsuitable to drink. Forfinished white wines, the ideal pH is between pH 3.00 and pH 3.30, while the final pH for red wine is ideally between pH 3.40and pH 3.50. The optimal pH before the fermentation process is between pH 2.9 and pH 4.0. The pH of wine therefore not onlyaffects the color of wine, but also the oxidation, yeast fermentation, protein stability, and bacteria growth and fermentation.