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Coloring thin nickel foils

Q. I am interested in a coating or coloring process to color thin (0.002-0.003") nickel foils. Does any possible process exist?

Steve Schwall
consulting engineer - Chicago, Illinois, USA
2005

A. Immersion in 25% nitric acid at room temp for a few seconds will turn them black.

Jeffrey Holmes, CEF
Spartanburg, South Carolina
2005

2005

A. You can use next solution:
240 gms sodium thiosulphate ⇦ this on eBay or Amazon [affil links]
25 gms copper acetate [affil links]
30 gms citric acid ⇦ this on eBay or Amazon [affil links]
1 lit water
16 °C temp.,20- 300 sec immersion time
According to Fishlock: Metal Coluring,Teddington 1962.

Goran Budija
- Cerovski vrh Croatia

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