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Old 2nd Dec 2019, 6:31 pm   #10
Vintage Engr
Heptode
 
Join Date: Jan 2008
Location: Shrewsbury, Shropshire, UK.
Posts: 823
Default Re: Black oxide coating on brass

Local gunsmiths should be able to supply you with either 'gun blue' or 'gun black'.

I've used it for years on steel & brass. Works well for blacking in engraving work as well.

David.
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