Lesley Alexander on sun 5 apr 98
With all our talk about toxics, I decided to retrieve a casserole
from a friend and send it to be tested. To my relief, I haven't poisoned her
and her crew!
It was glazed with a combination of glazes including a magnesium
semi-matt and a rutile glaze along with colors, fired to Cone 10 in a gas
kiln. I sent it to Twining Lab in Fresno, and at significant expense had it
tested for copper, cobalt and chrome. There was no cobalt or chrome
detected, and 5 parts per billion of copper. Twining Lab didn't have any
standards and they aren't used to doing just one bowl. The EPA sent me some
material about standards which is gibberish to me. Our water department
says one part per million of copper is allowable in drinking water, so I'm
not worried about the copper which is 1/200 of that.
So that's all to the good, but still I'll prefer to glaze the inside
of cooking/storing utensils with "safe" materials and be cautious about
other food ware.
DIANA PANCIOLI, ASSOC. PROF. on tue 7 apr 98
Dear Lesley:
May I ask what the cost was to have your glaze tested?
Thanks.
Diana
EMU
On Sun, 5 Apr 1998, Lesley Alexander wrote:
> ----------------------------Original message----------------------------
> With all our talk about toxics, I decided to retrieve a casserole
> from a friend and send it to be tested. To my relief, I haven't poisoned her
> and her crew!
> It was glazed with a combination of glazes including a magnesium
> semi-matt and a rutile glaze along with colors, fired to Cone 10 in a gas
> kiln. I sent it to Twining Lab in Fresno, and at significant expense had it
> tested for copper, cobalt and chrome. There was no cobalt or chrome
> detected, and 5 parts per billion of copper. Twining Lab didn't have any
> standards and they aren't used to doing just one bowl. The EPA sent me some
> material about standards which is gibberish to me. Our water department
> says one part per million of copper is allowable in drinking water, so I'm
> not worried about the copper which is 1/200 of that.
> So that's all to the good, but still I'll prefer to glaze the inside
> of cooking/storing utensils with "safe" materials and be cautious about
> other food ware.
>
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