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How to tarnish/age nickel plated furniture spots

What would be the best way to tarnish or age nickel plated furniture studs? They are really shiny and I just want to have them look dull. They are loose and not currently on the furniture yet.

Ashley
designer - Tracy, California, USA
2006

2006

Immersion black nickel:
potassium thiocyanate ⇦ this on eBay or Amazon [affil links] ....6 gm
sodium sulphate..........100 gm
ammonium persulphate.....200 gm
ferric sulphate..........10 gm
water....................1 lit
pH 1-2,instead persulphate you can use hydrogen peroxide
according to Fishlock: Metal Colouring, Teddington 1962.

Goran Budija
- Cerovski vrh Croatia

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