Hi, I will readily admit that I don't do much firing of transparent
enamels on silver, so I'm not the expert you were looking for. You
don't seem to be getting a lot of response on this though so I would
like to state two common problems it could be.
1) As someone else mentioned, to get really clear enamels you need
to remove the fines, or the powdery enamels that exist after
grinding. You need a little bit but not as much as is normal. Tom
Ellis did this by using 3 layers of sifting trays. 150 mesh on top,
325 mesh in the middle and a catch pan on the bottom. You use the
stuff that ends up in the middle tray to get the clear transparents.
He said to discard the fines, but most of us use them as counter
2) Many enamelists complain that they can't get a truly clear enamel
on silver from Thompsons. I agree that you should try Tom Ellis at
Thompsons and ask, but don't limit yourself to just that. You may
also want to call Coral Shaffer at 800-596-3257 or 206-525-9271, she
sells imported enamels that some of my friends have much better luck
with, of course, these are not lead-free as Thompsons are.