I want petina on my brass mod, and it's happening now nicely, but I'm wondering, does the patina ever stop or does it eventually turn brass black? How dark does the patina usually get on brass? Anybody know?
Does Patina on brass go black?
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Patina on brass is oxidized brass. When iron oxides it is called rust. The color of patina on brass will vary because brass is an alloy of copper, zinc and often some other metals. Generally, patina on brass will eliminate the golden shiny appearance. As patina progresses the brass will become brownish but not as brown as bronze patina. Given enough time and exposure to the elements a brass patina will look greenish as copper oxides begin to appear. It will never turn black on its own.
Thank you for your very comprehensive answer. The patina on my brass mod is now a smokey gold color and I'm hoping it doesn't get darker and certainly don't want it to turn green. Hopefully it doesn't have a lot of copper in it, and if it does, is there a way to buff it down just to the smokey gold color without taking all the patina off?
You can use a product like Nev-R-Dull lightly to clean patina a little. Use it more vigorously and you will get bright brass again. I have a brass door knocker and use Nev-R-Dull to keep the name area bright and the surrounding area in patina.
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Wow. Thanks for the pics! I guess with some things the patina can get quite dark. Hopefully it won't on my mod. I like both the patina and the shiny brass though. Maybe I should have two of these.
If mine was brass I'd probably have a shiny spot in the patina. I find it's become a habit to twirl mine in my hand when I'm sorting out details and writing up the daily log at work.
If you're wanting a patina on the brass, use regular windshield washing detergent for cars. Whatever the ingredient is, it will tarnish brass.
I do know if you toss another mod in with your brass one, it'll 'scratch' the patina off so it'll look like shiny scratches on the metal. This mod got patina so fast (about 5 days of using) that even if I wanted it shiny I wouldn't want to buff it so often.
Windshield wiper fluid...whodathunkit?
On the other end, I bathed my brass in a nitric acid solution and it brightened it and lightened the color. ( too much will eat it up! ) much less yellow and has stayed pretty much the same for about 2 weeks of constant handling!
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Google brass patina and see a bunch of stuff. There is a chemical, liver of sulfur, that will patina brass immediately. The best I have seen is dampen the brass with salt, I used kosher for the larger grains, and put it in a closed plastic container in ammonia fumes for about an hour.
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