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Thread: What turns Brass BLACK
10-29-2005, 04:32 AM #1
Somebodyhere must know the recipe for turning bright clean brass to a dull shade of black, what is the chemical/chemicals called that does this to brass????
What chemical/chemicals will make BRONZE turn into the old worn/weathered look of verdigis???
Somebody must have had to do this to some fittings at some time or other, all answers will be greatfully recieved.
10-29-2005, 05:31 AM #2
Well Radish1us I know exactly how to turn my brass black.
Firstly I take new shiny .300 Win mag brass put about 75 gr of AR 2209 in them & of course a primer & 130 gn slug.
So far they still retain their nice shiny patina.
Unfortunately after I fire them they turn just about black up to about 1/2 way along the case.
So maybe the answer is to put your brass in a pile of powder & light it up.
Perhaps this will tarnish your brass just as quickly. [img]smile.gif[/img]
10-29-2005, 10:51 AM #3
When I was studying metalsmithing years ago, we used to use something called liver of sulphur to blacken brass. It's available through jewelry supply houses like Rio Grande in New Mexico. I think I also found that cold gun blue applied with steel wool will also turn brass black. I haven't done it in awhile but I think I warmed the brass a bit as well.
10-29-2005, 10:59 AM #4
Bronze and brass can be made to look weathered by soaking the part in a solution of water and ammonia. At first the color will be a dull tarnished-brown appearence. If left long enough (two or three days) the surfice will turn to a green patina. Any kind of house whole ammonia cleaner will work. Brownells sells a solution to turn brass sight inserts black. I do not know what the chemicals are.
10-29-2005, 02:08 PM #5
seems my hands will do it in a week
amonia will do it.. the artists that use this techinque are begging for a lung problem, but they torch brass and spray amonia on it
10-29-2005, 03:03 PM #6
What Gazz said about cold gun blue works.
I've used it to age brass hardware. You apply it and wait a few minutes.
Then dry, oil and rub with four xxxx steel wool.
A little experimenting back and forth to achieve the look you want.
10-30-2005, 01:26 AM #7
Rub with a mixture of salt and vinegar and then expose to ammonia fumes for hours/days. A blue crust will form and under this will be found the green verdigris surface on the brass. I tried some of the brass blackening compound a few years back when I lived in AZ. It turns the brass quite black, a bit splotchy, and is not durable.
10-30-2005, 10:39 AM #8
Peeing on it will also put a patina on it - not black but a pleasant azure color. A friend had brought me a modern made brass sundial with an "applied" patina on it. I peed on it all summer and the "applied" finish peeled off and now it looks genuinely aged. I handed it to here and then told her how I did it. She got over it though as it did look good.