"ZINFANDEL #2" -Crystalline tartaric acid found in wine"Zinfandel #2" is a photograph of tartaric acid crystals taken through the microscope. Tartaric acid occurs naturally in grapes and plays a critical role in the taste, feel and color of a wine. Tartaric acid often crystallizes on the cork, yielding wine diamonds. These crystals were grown in the presence of zinfandel wine. The colors and image seen here are reproduced as I viewed them originally.