I keep ending up with tiny holes in the sterling silver castings I’m
doing. I can’t figure out why this keeps happening, nor how to
prevent it. I’m casting charms and small figures in sterling. Some
are carved from green or purple wax, some are blue injection wax.
Most of them come out OK after casting & cleaning. But some of them,
usually the ones that are most important, have tiny perfectly round
holes about the size of a 22/24 gauge wire. Some of the holes seem
to be very deep, others look like perfectly round hollow balls in the
wax. Are these being caused by bubbles in the wax? I checked this
last batch over very carefully under bright lights before sprueing
and investing them, and I didn’t see any bubbles. What could be
causing this, and how can I stop it from happening again?
Feathered Gems Jewelry