18k rather than 22k. Needless to say I
ended up having to solder most of the granules onto the surface
rather than fusing them
Rick, can you run that fusing process by us again. I didn't quite
understand how the copper and the adhesive combine to fuse the
David Arens had this to say 5-6-97
- "when the piece is heated to fuse/solder the granules to the
- backplate, the glue becomes a sort of charcoal & provides a
- reducing atmosphere to aid in the fusing/soldering action that
- takes place where the granule contacts the backplate."
The carbon in the hide glue becomes carbon dioxide and reduces
the metal oxides- the copper combines with the 22k gold alloy and
bonds the granules to the sheet surface. Probably hide glue is
traditional- other water soluable glues might work as well. You
have to realize that granulation has been done for several
thousand years. They got kids to do it- their eyesight was bad
by the time they were 12.
Several other people on the forum have more experience with
granulation than I do.
Richard D. Hamilton
Shop rule: Sailing is mandatory
Sailing on old gaff-rigged wooden boats
Fabricated 14k, 18k, and platinum Jewelry
wax carving, modelmaking, jewelry photography