Used as a humidity indicator in silica gel desiccants, where it changes color from blue (dry) to pink (hydrated) to show moisture absorption. Commonly employed in electroplating and metal surface treatment to enhance corrosion resistance and improve adhesion. Serves as a catalyst in various industrial chemical reactions, including petroleum refining (e.g., Fischer-Tropsch synthesis) and organic synthesis. Utilized in the production of pigments and dyes for ceramics and glass due to its intense color properties. Also applied in laboratories as a moisture-sensitive reagent in qualitative analysis, such as detecting water in solvents like alcohols.