BLACKENING PRODUCTS FOR METAL SURFACE ChatGPT said: Blackening products for metal surfaces are used to create a dark or black finish on metals, primarily for corrosion resistance, aesthetics, and to reduce light reflection. These products are part of a process known as metal blackening, black oxide coating, or bluing (in firearms and tool industries). Here's an overview of the types, applications, and common products: * Cold Blackening - Temp: Room temperature - Metals: Mostly for steel, some stainless steel options - Finish: Black-gray finish, needs sealing (oil, wax, lacquer) - Pros: Easier, safer, low investment. * Hot Black Oxide - Temp: ~135–145°C - Metals: Steel, stainless steel - Finish: Deep black, mildly corrosion-resistant (often requires oil or wax topcoat) # BLACKENING Chemical Manufacturer.