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topic 9451

Flat Black Patina for copper


I want to obtain a flat black finish on copper. This is for the purpose of absorbing heat from a radiant source. I would like to have the black coating be thermally conductive and not a black "paint" laying on top of the copper. It will not be exposed to wear so the finish does not have to be very hard. A finish that would inhibit oxidation would be great. It must withstand temperatures of up to 650 F.

Are there finishes for available that would allow me to tint some small prototype samples? Is there a disposal problem with the solutions involved? If production is needed, is this an expensive process?

Ray Christison
- Madison, Alabama


You need to use a copper oxidizing formulation like Ebonol from Enthone. The bath will be highly caustic and dangerous to use and poses a disposal problem since it is copper bearing. Find a professional to do the job for you!

Russell Richter
- Danbury, Connecticut, USA

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