Does cornstarch causes rust after burn?

Cornstarch itself does not cause rust, as rust is the result of iron oxidation in the presence of moisture and oxygen. However, if cornstarch is burned, it can produce ash and other residues that may retain moisture, potentially contributing to rusting on metal surfaces if they are not cleaned properly. To prevent rust, it's essential to ensure that any surfaces exposed to cornstarch residue are cleaned and dried thoroughly after use.