Monona Rossol on tue 15 apr 97
> It's interesting that you can start out with four reasonably insoluble
> materials, plus one somewhat soluble one, and end up with something that
> literally comes apart in weak acid. I wonder what is in that stain?
> There's a lesson or two in this. <
I THINK I'VE DIED AND GONE TO HEAVEN.
This is what I've been talking about until I have alienated half the world.
From what I've seen, the solubility of glaze ingredients before firing is
irrelevant to the solubility of the finished glaze. And the heat stability
and acid resistance of a stain has no relationship to its resistance to acid
in the final glaze.
When we fire the glaze ingredients together, we create a whole new entity
whose properties are unique and individual. Until we have a lot more test
results on glazes, we don't have a shot at even making educated guesses
about which glazes are safe.
Monona Rossol, industrial hygienist
Arts, Crafts and Theater Safety
181 Thompson St., #23
New York, NY 10012-2586 212/777-0062