When water gets stuck or pools in the bottom of an old, well-seasoned cast iron skillet, it is usually due to a combination of factors. Cast iron skillets develop a layer of seasoning over time, which is essentially a thin coating of polymerized oil that creates a non-stick surface. However, even a well-seasoned skillet may have areas where the seasoning is not as effective or may have worn down.
Here are a few reasons why water might get stuck in the bottom of a cast iron skillet:
Uneven seasoning: If the skillet's seasoning is uneven or has worn off in certain spots, water can accumulate in those areas. Seasoning can degrade over time with use and cleaning, so it's normal for a skillet to have some variations in its non-stick properties.
Surface imperfections: Cast iron skillets can develop minor imperfections over time, such as small pits or rough patches. These imperfections can create small pockets where water can collect and become trapped.
Improper drying: If the skillet is not adequately dried after washing, residual moisture can accumulate in the bottom. It's essential to thoroughly dry the skillet, including the bottom, to prevent water from getting trapped.
Temperature differences: Sudden or extreme changes in temperature can cause condensation to form on the skillet's surface, leading to water accumulation. For example, if a hot skillet is placed under cold running water or exposed to a cool environment, moisture can collect at the bottom.
To prevent water from getting stuck in the skillet, make sure to dry it thoroughly after each use. Use a paper towel or cloth to remove any excess moisture, and place it on low heat for a few minutes to ensure complete drying. Additionally, periodically checking and maintaining the seasoning of the skillet will help create a more even and non-stick surface.
If you encounter persistent water pooling or excessive rusting in your cast iron skillet, it might be beneficial to strip off the old seasoning and re-season it from scratch. This process can help restore the skillet's non-stick properties and eliminate any rough spots or imperfections that could be causing water accumulation.