VC BLACKENING SALT -VCBLK HB-18 Blackening salts are often used in metalworking processes such as black oxide coating, which creates a dark, corrosion-resistant finish on metals like steel and iron. These salts typically contain a mixture of chemicals that facilitate the blackening process, such as sodium hydroxide or potassium hydroxide, along with various oxidizing agents. If you need detailed information about the specific composition, usage, or safety considerations of VC Blackening Salt - VCBLK HB-18, it's best to refer to the manufacturer's documentation, safety data sheets (SDS), or contact the manufacturer directly for assistance.