THE ROOM TEMPERATURE CHEMICAL USED BY GUNSMITHS AND INDUSTRY TO BLACKEN ALUMINUM PARTS. RESTORES SCRATCHED AND MARRED AREAS QUICKLY. FAST-ACTING LIQUID IS EASY TO APPLY WITH NO DIMENSIONAL CHANGE. COLOR WILL VARY FROM DEEP GRAY TO BLACK DEPENDING ON ALLOY. ALUMINUM™ BLACK METAL FINISH IS ALSO EXCELLENT FOR BLACKENING NAME PLATES, PLAQUES, TROPHIES AND OTHER ENGRAVED ITEMS.