👉 Overoxidization is a process in which an object's color or appearance changes due to an oxidation reaction. This can happen when a chemical substance, such as iron (Fe), reacts with oxygen (O2) and forms a compound called ferric oxide (Fe2O3). The compound iron(II) oxide is then oxidized even further by the presence of other chemicals, such as water or acids. The term "overoxidization" refers to this oxidation process. It can occur in