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Blackening of white metal

I want to blacken white metal. Is there any chemical to blacken it?

Ajay Singhvi
- Rajasthan, India
2001

If you are talking about white metal as in pewter that is mostly tin there is a chemical oxidising process that is made up with nitric acid 5% by volume and copper sulphate ⇦ on eBay or Amazon [affil link] 1/3 oz/gal (oz av & US gallon. Parts are simply immersed until the darkness required is achieved then rinsed and dried.

Bob Lynch
plating company - Sydney, Australia
2001

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