...I am working on a bracelet project where I have combined PMC3
with PMC gold in layers. I am very confused about how to fire
it...... can you overfire PMC3? If I stick it in their and fire it
for 90 minutes under the gold schedule will it be ok?
Most CZs can be fired at any of the metal clay temperatures; some
colors like blue, green, and black are not stable and may be subject
to color change when fired at higher temperatures.
As for firing your bracelet, you should fire it as long and as hot
as possible to give you the most durable piece possible. So yes, fire
for 90 minutes at 1650F. If you only fire at 1290F, the bracelet is
likely to break. As long as you don’t exceed 1650F, you cannot
"overfire" the silver clay. After 2 hours at 1650F, the silver will
have reached its maximum shrinkage, but longer will not hurt it.
Mary Ellin D’Agostino, PhD
Sr. Teacher, PMC Connection
Certified Artisan, PMC Guild