Cast-iron skillets can rust if they are not properly cared for, but they do not get moldy. The reason people may associate mold with cast-iron skillets is often due to misinformation or confusion between different types of cookware.
Rust can develop on cast iron if it is exposed to moisture and not adequately dried or seasoned. The iron in cast iron is susceptible to oxidation when it comes into contact with water or moisture, leading to the formation of rust. To prevent rust, it's important to properly clean and dry the skillet after use and apply a thin layer of oil to protect the surface.
Mold, on the other hand, typically grows on organic materials in a moist environment. Cast-iron skillets are not prone to mold because they are made of solid metal and do not provide a suitable environment for mold growth.
However, it's worth noting that if you store a cast-iron skillet with food residue or moisture trapped on its surface, it can potentially develop mold-like growth. This can occur if the skillet is not cleaned and dried thoroughly before being stored. Therefore, it is important to clean and dry your cast-iron skillet properly after each use to prevent any potential issues.
To summarize, while cast-iron skillets can rust if not cared for properly, they do not typically get moldy. Taking the necessary steps to clean, dry, and season your cast-iron skillet will help maintain its quality and prevent rusting.