Why should Madeira and Sherry be stored upright?

• A. To prevent the label from peeling.
• B. To maintain humidity.
• C. To prevent cork deterioration from temperature shifts.
• D. To prevent cork erosion by alcohol.

Answer: (D)

The key idea is that fortified wines have higher alcohol content, and alcohol can interact with a natural cork over time. When a bottle is stored on its side, the cork stays immersed in wine, giving ethanol easier access to the cork material. Over long storage, this can soften or erode the cork, compromising the seal and potentially leading to leakage or oxidation. Storing upright reduces the cork’s contact with the wine, limiting that alcohol-driven attack and helping preserve the cork’s integrity. It’s not primarily about humidity, labels, or temperature changes; it’s about protecting the cork from alcohol erosion.