Spots or patches on a cast iron skillet are typically caused by rust or incomplete seasoning. While they are not ideal, they are relatively common and can be addressed. Let's look at the common causes and how to deal with them:
Rust: Cast iron is prone to rust when it comes into contact with moisture. If your skillet is not properly dried after washing or if it has been exposed to high humidity, rust spots may develop on the surface. Additionally, acidic foods, such as tomatoes or citrus, can also contribute to rusting if left in the pan for an extended period.
Incomplete Seasoning: If the seasoning layer on the skillet is not well-established or has worn off in certain areas, those spots may appear less seasoned, lighter in color, or prone to rust.
Normal Wear and Tear: Over time, with regular use and cleaning, some spots may experience more wear than others. This is a natural part of the life cycle of a cast iron skillet.
Dealing with spots on a cast iron skillet:
Remove Rust: If you notice rust spots on your cast iron skillet, you can scrub them gently with steel wool or a scrubbing brush to remove the rust. Afterward, wash the skillet, dry it thoroughly, and apply a thin layer of oil to re-season the pan.
Re-Seasoning: If the seasoning appears incomplete or uneven, you can re-season the entire skillet to ensure a consistent and protective layer.
Cooking with Uneven Spots: While it's best to have an evenly seasoned surface for optimal cooking performance, you can still use a cast iron skillet with spots. Just be mindful of those areas and consider avoiding cooking acidic foods in those spots, as they can compromise the seasoning and lead to rusting.
Improving Seasoning: Continue to use and maintain your cast iron skillet regularly. With time and proper care, the seasoning will naturally improve, and the spots may become less noticeable or disappear.
Cooking Oils: Using oils with high smoke points, like vegetable oil or flaxseed oil, can contribute to a more durable and effective seasoning.
With proper care, even a cast iron skillet with spots can last a long time. The key is to keep the skillet dry, avoid cooking highly acidic foods in those areas, and maintain the seasoning regularly. Cast iron cookware can be incredibly durable and versatile, and with proper attention, it can continue to serve you well for many years.