One of the most important tasks when finishing a platinum
casting is burnishing. Yes, I know it takes extra time, yes, I
know hardly anyone is willing to do it but it is a fact of life.
Ideally you want to use a highly polished Tungston burnisher. I
do not recommend steel. In the gold leafing industry, there are
some wonderful agate burnishers. They are being used to burnish
the gold leaf into place. These work wonderful on platinum, as
they dont scratch, don’t contaminate and can be re-polished with
tin oxide or diamond . After filing and sanding your casting,
burnish the entire surface and then go on to polish. Your results
will be far superior.
have a platinum day
PLATINUM GUILD INTERNATIONAL USA
Jurgen J. Maerz
Manager of Technical Education
JA Certified Master bench Jeweler