I use aluminum black and a couple other similar chemicals in my bladesmithing work - you can accomplish some really pretty colors depending how much you apply, how long you leave it, altering the pH, etc. Can even chemically “paint” stuff on the metal too if your careful with it.
I have used aluminum black, but what are the other chemicals you use? You can just name them if you want I can search them after that to see start they do etc.
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