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Cheap wine sold in PET bottles often contains additives and chemicals rather than just grapes. Many consumers are unaware of the extent of chemical manipulation involved in wine production. While legally, wine should consist solely of grapes, producers frequently enhance flavors and colors using various approved additives. Advances in winemaking science have allowed for the creation of specific yeasts and fermentation methods to improve efficiency and taste. Some inexpensive wines may contain little to no actual grape content, relying instead on water, alcohol, and artificial flavors. This raises concerns about the authenticity and quality of such products.