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Aging Tinplate

I am trying to age T2 tinplate from the factory shine to a darker pewter-like colour. I have soaked the panels in 5% acetic acid ⇦ this on eBay or Amazon [affil links] ( vinegar ⇦in bulk on eBay or Amazon [affil links] ) but this doesn't seem to work. Any ideas? Thanks.

Joe O'Donohoe
- Ontario,Canada
2000

I have had customers who use a two step process of caustic - then rinse - then use "gun barrel bluing"

Michael Amann
- Baltimore, Maryland, USA
2001

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