Chemical that blackens brass? RPF Costume and Prop Maker Community

I'm working on a prop made from brass and after buying multiple different chemicals, I can't find one that works effectively. At my old job, we had a mason jar full of a clear liquid that you could drop a brass buckle into and by the time you could fish it back out it was completely black, and

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Chemical that blackens brass? RPF Costume and Prop Maker Community

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