Re: Black oxide coating
I have some Liberon black antiquing fluid (tourmaline) which is for aging brass, copper and bronze. I haven't used it for some time , as I remember the results can be a bit variable. After use the treated area is recommended to be covered in Jade oil to seal and protect from moisture. It also contains Selenium Dioxide and Nitric Acid so has to be used with care. Not sure if it is still available.
Mike.
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