In order to use sterling silver findings with metal clay:
-
Use a heavier finding than you might if you were soldering after
firing the metal clay. -
Use a metal clay formula that fires at the lowest temperature for
the shortest time. Longer firing and higher temps disrupt the
sterling’s integrity. -
You can coat the sterling finding with metal clay Slip or paste
to try to cut down on the inevitable firescale. -
Pickling will help remove the firescale, but when using a metal
clay that fires at low temp and for short duration, the resulting
metal is a bit less dense than I like it to be, and can absorb some
pickle. In order to remove the pickle from the fired object: Prepare
a saturated solution of baking soda (sodium bicarbonate) and water
in a nonreactive, heat-resistant pot (stainless steel is best); Bring
it to a boil and immerse the fired object in the solution; Any
residual pickle will have been neutralized after about 20 minutes;
Remove your piece and finish as normal.
[!!!] all of this step, including the pickling, assumes that you have
not set a stone(s) in the unfired metal clay and fired them in place.
some stones might survive the pickle and/or the neutralizing bath,
but i wouldn’t take a chance doing either or both with a stone set in
place.
Hope this helps,
Linda Kaye-Moses