Copper and Brass
Ultra-Blak 420 for Copper/Brass
This black oxide is an oxidizing salt mixture for blackening copper, brass and bronze. Used at a concentration of 2 pounds per gallon of water at temperatures of 200° to 210° F to blacken copper surfaces with a deep black, abrasion resistant finish. It must be used in conjunction with EPI’s E-Prep 220 brass activator to blacken high zinc (15% to 35% zinc) copper alloyed surfaces.
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