Janet H Walker on thu 25 feb 99
...as I struggle to understand glazes,etc....
Glossy and safe cone 6 black is an elusive quest I'd say. Since you
already have a glaze that is both glossy and black, I'd recommend that
you start by having it tested for food safeness.
There is a very easy way to do this. The Alfred Analytical Lab will do
the testing. You just have to send them a fired piece that holds more
than a cup of liquid and they will test for whatever chemicals you need
to worry about. If you tell them the recipe, I bet they will even tell
you which of the metals you need to be worried about.
Call Roland Hale, the director of the lab, at 607 478-8074.
There is, in the archive somewhere, a wonderful message from Bonnie Hellman
detailing how she went about getting something tested there, how the whole
process worked, and so on. I recommend this highly as part of an organized
search for just the right glaze to commit your production to.
cambridge, MA USA