[color me blue]

Thanks for your help, everyone; it was a very warm welcome for someone who has never posted here before. Thanks, again.

I'm looking for ways to permanently blacken a cheap aluminum slide that I'm going to get engraved with the proper trades....the only thing I've found is Birchwood Casey Aluminum Black Metal Finish but the description says: "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."

I'm curious to know if anyone has tried using this and if it works?