Growel Al Black Description Immersion blackening process for Alumunium and Alumunium alloys. It is a faster, simpler, and cost-effective alternative to black anodizing. Characteristics: Replacement of Costly black anodizing process. Jet black deposit It's an easy-to-use finish that requires no special equipment or procedures. Rack and Barrel processes are applicable. RoHS compliance Applications: Room-temperature immersion and a swab-on solution process. For Small machine parts, Grommets, screws, and other Hardware get a quote