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Ted Mooney, P.E. RET
Pine Beach, NJ

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Blackening nickel coated zinc

2003

We are a manufacturer of writing instruments. We recently started an additional line of keychains, etc.

We have the capability to laser engrave our products. We are searching for a method of cold blackening the laser engraving. The products we are having trouble with are nickel plated zinc. The laser burns through the nickel plating into the zinc base metal underneath. We are searching for a method of blackening the zinc engraving without staining the nickel outer coating.

A material analysis lab has determined that the nickel coating is a standard nickel and the zinc base metal is similar to ASTM B86, Alloy 3.

Ernie Zielinski
- Coventry, Rhode Island

Black color for zinc: 12 gm copper sulphate ⇦ this on eBay or Amazon [affil links] 15 gm potassium permanganate ⇦ this on eBay or Amazon [affil links] 1 lit water Hot immersion( cold solution works slow)!

Budija Goran
- Zagreb, Croatia
2003

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