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question about toxicity

updated fri 29 dec 00

 

Daisypet@AOL.COM on thu 28 dec 00


As usual, I am behiind in reading my Clayart messages--only have about 350
more to be caught up! The thread about the toxiciy of underglazes and the
potential problem with their use gives me another thought. I do not do
majolica work but have observed others-even going to a workshop that included
the methods. Some of the people use underglazes OVER their glaze. I don't
remember that they stressed glazing over that again. Is the quantity that
they use so minuscule that it would not be a factor? I have a wide selection
of underglazes and many are more than 5 years old since I use such small
amounts in some decorative ways and I do glaze over them, but not with the
glaze that particular company sells.

Seems that I 'lurk' and just read and learn most of the time. I have been
shot down a few times when I have written and, I guess, get a little gunshy
but will write in if I have something to contribute or ask. A wonderful part
of this forum is that the frequent writers become friends and they don't know
me, but I feel as though I know them. I met some nice people at NCECA
Columbus and look forward to meeting many more in Charlotte!

Most sincerely,
Phyllis

Phyllis Tilton
Daisypet@aol.com

John Hesselberth on thu 28 dec 00


Daisypet@aol.com wrote:

> Some of the people use underglazes OVER their glaze. I don't
>remember that they stressed glazing over that again. Is the quantity that
>they use so minuscule that it would not be a factor?

Hi Phyllis,

Unfortunately, there is no way to answer your question short of testing.
Putting a STABLE clear glaze over an underglaze can offer some
protection. Putting underglazes on top--who knows?? I certainly would
not do it on a functional surface without testing Even then it doesn't
sound like a very good idea.

Regards, John

"The life so short, the craft so long to learn." Hippocrates, 5th cent.
B.C.