BrendaZ on thu 2 mar 06
Michael Wendt said:
"Just be sure to remind them not to use the colors on the inside of vessels for
food contact (the pigments go into solution in glaze and may be mobile)."
I was surprised by this statement, as the Amaco Product safety manual states:
"All AMACO® underglazes are lead-free and are considered dinnerware
safe when a dinnerware safe glaze is applied over them."
If the underglaze is bisqued before the top-coat of glaze is added, I would guess that the pigments would not go into solution in the glaze.
Brenda.
Ron Roy on sat 4 mar 06
Hi Brenda,
There is no doubt that underglazes go into solution in the glaze over them
- what temperature you are firing the glaze to determines to what extent it
goes in.
Then - the durability of the over glaze determines how much gets into food.
Lead is certainly not the only consideration - although lead and Cadmium
are the only controlled toxins here in NA.
John and I point out in our book that we feel undrglazes should not be used
in liner glazes so we agree with Michael in this.
Other countries have more controls by the way.
At least make sure that the glaze you put over them is a durable glaze and
limit the amount of underglaze you use. You might even think about having
the combinations you use tested for metal release.
RR
>Michael Wendt said:
>"Just be sure to remind them not to use the colors on the inside of vessels=
for
>food contact (the pigments go into solution in glaze and may be mobile)."
>
> I was surprised by this statement, as the Amaco Product safety manual sta=
tes:
> "All AMACO=AE underglazes are lead-free and are considered dinnerware
> safe when a dinnerware safe glaze is applied over them."
>
> If the underglaze is bisqued before the top-coat of glaze is added, I
>would guess that the pigments would not go into solution in the glaze.
>
> Brenda.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
=46ax: 613-475-3513=20
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