Date Uploaded: March 14, 2003, 6:34 pm
Last Edited: August 7, 2012, 5:52 pm
Print this Article
Browning Copper with Ferric Nitrate
Article © MAIL User: Drax
Ferric Nitrate Browning Solution
Target metals: Copper, Brass, Bronze
Target colors: Brown
This solution will turn copper alloys into a dark brown color, basically the color of old copper pennies. This recipe comes from The Complete Metalsmith by Tim McCreight.
To make the solution, mix:
1Tb Ferric nitrate
Method of use: Dissolve the ferric nitrate in the water, solution is sort of an orange-brown color. Spray onto the copper item you want to turn brown!
The spray needs many applications to get a good coating (around 10 or so). The copper and brass turned a very dark brown, the bronze turned a lighter, more uneven brown. The brown patina itself is pretty stable, but seemed a little more flakey on the bronze. But it is actually quite plier resistent. Results still may be best after all plier work is done, though.
The picture shows a brass ring on the left, a bronze ring on the right, and their browned equivalents below.
Original URL: http://www.mailleartisans.org/articles/articledisplay.php?key=133