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Author Topic: Copper, Bronze and Brass Patina Formulae  (Read 2480 times)
Burgess Shale
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« on: March 27, 2015, 10:57:10 pm »

For those of us that work in metals and do not wish to have the bright and shiny look for the pieces, Science Company has a list of formulae and instructions on patinating copper, bronze and brass with a variety of colors, provided that you want reds, browns, blues and greens.

http://www.sciencecompany.com/Patina-Formulas-for-Brass-Bronze-and-Copper.aspx#17
« Last Edit: April 21, 2015, 06:25:28 am by CPT_J_Percell » Logged

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« Reply #1 on: March 28, 2015, 01:53:00 am »

Nice find.  Nice that they are giving formulas and not just off to sell something.
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Argus McJohnsten
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« Reply #2 on: March 28, 2015, 02:54:18 am »

Bookmarked. Thank you.
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« Reply #3 on: March 29, 2015, 01:53:42 am »

A couple more if you are wanting to give brass a matt black coating.

Selenium Toner: Dilute one part toner to four parts water. Immerse the part to be coloured for five to twenty minutes or until the desired colour is reached. Rinse well and dry.

Ammonia Copper Carbonate: Dissolve a teaspoon of copper sulphate in 100ml of water. Add a teaspoon or two of sodium carbonate (washing soda) gradually - It will fizz and froth up, so add a pinch at a time. Filter the precipitate and wash with hot water a few times. Dissolve the precipitate in household ammonia (usually a 5% solution) and immerse the part for five to ten minutes. Wash and dry.

Please do not dispose of the solutions down the drain or in a cesspit - Copper is toxic to wildlife and the environment.
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« Reply #4 on: April 21, 2015, 12:28:51 am »

Bookmarked.. excellent.. thank you Smiley
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« Reply #5 on: April 21, 2015, 12:36:42 am »

Could the mods maybe lock this thread? And make it a different color like the other threads at the top?

Please and thank you!
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« Reply #6 on: April 21, 2015, 01:11:15 am »

Could the mods maybe lock this thread? And make it a different color like the other threads at the top?

Please and thank you!

You mean "sticky" it? I shall bring the request to Herr Döktor's attention.
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« Reply #7 on: April 21, 2015, 01:32:53 am »

My apologies! I did mean sticky! So sorry for any possible confusion.
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« Reply #8 on: April 21, 2015, 06:26:11 am »

Done as I agree that this needs to be sticky!

Thank you for sharing.
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« Reply #9 on: October 30, 2015, 12:52:58 pm »

Please do not dispose of the solutions down the drain or in a cesspit - Copper is toxic to wildlife and the environment.

How ought these solutions to be disposed of?  If hobbyists are using them it would be good to know.
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Serrac
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« Reply #10 on: October 30, 2015, 01:40:42 pm »

Most councils will have a waste disposal site - Usually for large items of domestic waste that they won't collect from the kerbside. Some of these waste disposal sites will have facilities for handling toxic/hazardous items (engine oil, lead acid batteries, paint, etc).

In the past, I have mixed small quantities of toxic chemicals in with old engine oil and disposed of it via the local recycling point.
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« Reply #11 on: October 30, 2015, 01:43:20 pm »

oooh nice. I needed this.
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« Reply #12 on: October 30, 2015, 08:47:49 pm »

Please do not dispose of the solutions down the drain or in a cesspit - Copper is toxic to wildlife and the environment.

How ought these solutions to be disposed of?  If hobbyists are using them it would be good to know.

WARNING: THE FOLLOWING ADVICE IS BASED ENTIRELY ON AMATEUR KNOWLEDGE AND SHOULD NOT BE FOLLOWED BY ANYONE

Copper carbonate has poor solubility in water. You should be able to mix the ammonia/copper carbonate solution with water, then boil off the ammonia to leave the copper carbonate in suspension. Allow it to separate and then filter the solids from the water. The solid copper carbonate should be disposed of in accordance with local regulations if they exist, but otherwise should be safe for landfill. (It's certainly safer than a lot of unregulated waste that ends up there.)

The selenium toner Serrac mentioned is a commercial product, and should come with its own disposal instructions in the package.
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