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Birchwood Casey Aluminium Black liquid can be applied at room temperature to blacken aluminium parts. Used by gunsmiths and industry specialists to restore scratched and marred areas. Excellent for blackening name plates, plaques, castings, sculptures and other home, workshop and hobby uses. Colour varies depending on alloy and can be highlighted if desired. Apply to thoroughly cleaned metals that are free of rust. ONLY suitable for aluminium. This is NOT Suitable for stainless steel / brass / copper or bronze.