Micky; It is relatively easy to fuse 22k or 24k gold into most
platinum alloys. It works very well, I wrote a workshop article for
Lapidary Journal years ago that detailed the process in the surface
of a pair of wave pattern bands. I stippled the surface of the
platinum in the recesses, which were about .8mm deep. PMC shrinks,
and from what I understand, the temperature would be more critical,
as well as the clay being more expensive.