I have some zinc chromate I use to color some parts ... comes out a bit different every time, but does give the zinc plated parts that old school sorta brass/rainbow look. I'm sure not as durable as the factory stuff.
Problem is, it's the Hexachromate stuff ... dangerous. Banned in the US for treating parts these days, still legal in Europe I think. It's a treatment that is done over the zinc to stabilize the surface to resist corrosion better. All you do is dip the freshly zinc'ed part in ..but the key seems to be temp, time and mixture .... only takes like 30 seconds .... sometimes it works, sometimes it doesn't. Haven't figured it out, and it's likely I never will.
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