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Darken nickel marked with a laser

I am about to begin laser marking chrome plated items. The procedure will burn through the chrome and actually mark the nickel. I need something that will make the nickel mark as dark as possible. Can you help?

Thanks,

Joe Bottieri
Engraving - Indian Harbour Beach, Florida, USA
2004

Black nickel might work. It tends to be a very dark grey rather than a true black. It also is a very picky bath to run.

James Watts
- Navarre, Florida
2004

2004

Black colour for nickel:

1 lit water
0,5 gm potassium thiocyanate ⇦this on eBay or Amazon [affil links] (KCNS)
5 ccm H2SO4
25 ccm hydrogen peroxide(30%)
temp.15 °C,cca. 15 min.

Use only fresh solution!Good luck!

Goran Budija
- Cerovski vrh Croatia

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