I am working on a commission piece that is beyond my expertise. I
made several pieces that were a complicated sculptural sterlingpiece
that I then built a wax setting around and cast in 14kt gold. They
came out wonderfully.
One of my friends - a 4th generation watchmaker has requested a
similar piece in platinum (sculptural element) set in 18 kt yellow
I am outsourcing the platinum casting of the focal element to a
source in LA. I don’t have a shielded gas setup.
I was planning in cleaning up the platinum casting and building the
setting around it…& then casting the 18kt around it.
The flask will be around 1200 - 1250 F.
Do I need to shield, treat, coat, flux or anything to the platinum
piece in the flask? Or, does it behave similar to the
sterlingbimetal casting with an 14kt yellow gold? I had issues with
14 kt gold elements set in wax with the sterling cast around it. The
sterling flashed over the 14kt gold or other issues that were
failures. I was using fresh alloy from the refiner.
Any preventative problem wisdom is appreciated. He’s a great friend,
client and collaborator. I am excited and nervous.
Eileen in LA