How do you tell if cast iron skillet is bad?

* Rust: Rust is the most obvious sign that a cast iron skillet is bad. Rust can occur when the skillet is not properly seasoned or if it is left wet for too long. Rust can also be caused by using the skillet with acidic foods, such as tomatoes or vinegar.

* Cracks: Cracks are another sign that a cast iron skillet is bad. Cracks can occur when the skillet is dropped or if it is subjected to extreme temperatures. Cracks can also be caused by using the skillet with too much force.

* Warping: Warping is a condition in which the skillet becomes uneven or misshapen. Warping can occur when the skillet is heated unevenly or if it is dropped. Warping can make it difficult to cook food evenly in the skillet.

* Pitting: Pitting is a condition in which the skillet develops small holes or pits. Pitting can occur when the skillet is used with too much force or if it is not properly seasoned. Pitting can make it difficult to clean the skillet and can also affect the cooking performance.

If you notice any of these signs, it is best to discard the cast iron skillet.