this part is no problem but if the object is left in the solution to cool down then this air pocket will contract it will pull into it the solution. Best reds are from weak solutions boiled over a longer time, several hours.Ī point to consider when using this process is that when a cold object is placed into the solution and boiled any gas or air trapped in porosity or internal closed cavities will heat up and expand. varying the time and strength of solution will very the color. The red oxide produced is the reddest I have ever seen on brass or bronze by any other means and the oxide compound is so stable that it does not require waxing to keep the color. It is easy to make but requires handling strong nitric acid and will produce a brown vapor that is toxic so not recommended for novices. it is a very deep blue crystal not to be confused with copper sulphate a light blue or sky blue crystal. To find copper nitrate, look at artist supplies as it is a very common Patina chemical used in art foundries. do this in a stainless pot or old stainless sink placed over a gas burner, the solution will corrode any other common metal container so must be stainless. The best way to mass color copper, bronze or brass red is to boil it in a mild copper nitrate solution.
Patina brass archive#
There is also very good old book on colouring of metals by A.Hiorns at internet archive web site, and download is free! Hope it helps and good luck.
Patina brass how to#
there you can find many other ways how to colour copper or copper alloys red. Try Hughes/Rowe book "Colouring, Bronzing & Patination of Metals" [affil link Is there some way to dye a natural copper red to achieve an opaque or translucent finish, or is paint the only way? Tracy MaislĪ. I get great results this way, but am trying to find a less time consuming method so that I can mass produce some of these parts for wholesale distribution. I am an artist currently coloring my copper red by heating and quenching. Thanks :-)Ĭold immersion! Golden yellow-orange-dark red Pranam!ġ00 gm potassium ferrocyanide Īrtist wants easier way to "redden" copper May 12, 2008 note: Thanks Dan! Readers with the same needs as Abir view this thread every day if you're willing to share knowledge, please simply offer a quick tip.
I specialize in patinas and would be happy to share knowledge if you are still inquiring. I stumbled on your posting and was wondering if you got any good responses for a red patina applied cold. "The Colouring, Bronzing and Patination of Metals"
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