COLD BLACKENING CHEMICAL - VCBLK HB-18 "Cold blackening" typically refers to a process used in metalworking, particularly with steel and iron, to impart a black oxide finish on the surface of the metal without the use of heat. This process is often used for decorative purposes or to provide corrosion resistance. Cold blackening involves applying a chemical solution or paste to the metal surface, which reacts with the surface to form a layer of black oxide. The specific chemicals used can vary, but they often include compounds such as selenium dioxide, copper nitrate, or other proprietary formulations.