I made some buttons out of PMC+ and PMC3. I used wire to make the
shanks. I was instructed by my PMC instructor to use fine silver
with the PMC+ but that I could probably use sterling with the PMC3.
She said firing temps were low enough with the PMC3 that the sterling
shouldn’t be bothered. It worked for me, I fired some with a torch
and the rest went in the kiln and they all turned out great. I placed
a small piece of clay through the ring and used slip and syringe PMC
to ‘set’ the shanks.
I would worry about firing temps and times were I to mix copper and
silver clays together. Too spendy for me to experiment with but I’d
love to hear if anyone else has tried this.