UB 420 copper hot black agents this product is a colorless liquid, alkaline oxidation blackening agent, can be used in large areas of black copper, copper and copper alloys, coatings blackness over acidic black film, and the film layer adhesion, and special wear-resistant, can also be used to rinse the color. First, the process degreasing → washing → activation → washed three times with three black → → → closed two washing three times, the equipment stainless steel, according to the shape of the workpiece to be processed, weight and other requirements, choice of stainless steel baskets, hanging, hooks and so on. Third, pay attention UB 420 is alkaline, avoid contact with eyes, skin and clothing. Not be mixed with other chemicals. Wear goggles, rubber gloves, aprons and other protective equipment when in use.