Which of the following factors affects extraction during winemaking?

• A. Temperature
• B. Time on skins
• C. Skin & juice management
• D. All of the above

Answer: (D)

Extraction during winemaking is the process by which compounds from grape skins, seeds, and pulp dissolve into the juice. It's driven by how long the juice is in contact with skins and the conditions that influence that contact. Temperature affects how quickly these compounds diffuse and how soluble they are; higher temperatures speed up extraction of color, tannins, and flavor, though they can risk bringing in harsher compounds if pushed too far. Time on skins directly increases the amount extracted—the longer the contact, the more compounds transfer—though over-extraction can lead to overly tannic or bitter wines if not controlled. Skin and juice management covers how the cap is handled, how juice is circulated or pressed, and when pressing occurs; these decisions control the level and duration of skin contact and thus how effectively extraction happens. Put together, these factors all influence extraction, making All of the above the best answer.