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Black Platinum


#1

I am seeing more black coloring on jewelry these days and I am
designing a couple of pieces that could use some black coloration.
The coating would of course need to be durable.

When I asked a salesperson in a jewelry store what kind of coating
was on a piece she had in her display case, she sid tat it was
oxidized platinum. Has any one heard of this or any other durable
processes that are black. Fascinated with faceting…

Dennis


#2
   oxidized platinum. Has any one heard of this or any other
durable processes that are black. Fascinated with faceting... 

Hi Dennis

It seems likely that the black platinum could have been Pt/Pd alloy.
One day while I was soldering a platinum jump ring with another
platinum tag (Pt850, 15% palladium), using propane gas torch, the tag
(which was placed a bit away from the hottest zone) changed its color
into a sort of brownish-black. I could remove this by pollishing with
abrasive. Given that oxidized palladium exhibit multiple color change
around 600C, I guess I experiencede that by chance.

Maybe one can control the degree of oxidization and the color by
putting Pt/Pd alloyb into a klin?

Would love to hear more from expertise - I’m also interested in black
colouring of metals, especially those involve oxidization.

Akiko


#3

She said oxidized platinum? NOT likely. “Black Rhodium” is becoming
more popular. I’m not sure its really rhodium but the suppliers that
carry plating solutions would (or should) know. You could plate
platinum with copper for instance, and patina it to your hearts
content. I’m not sure I would recommend copper, but the black
rhodium might be a way for you to get your two tone contrast. Email
me a picture when its done if you don’t mind, I’d love to see it.

Daniel Ballard