CNW on sun 2 may 99
I primarily make sculpture but occasionally make pieces that could be used =
as
food containers. I haven't used glazes in the past except for the commercial
clear on the inside if pieces that could be used for food. Since this is =
pretty
rare I haven't even gone through the first pint yet.
However another sculptor and I have been experimenting with some wonderful
colors that I know could NOT be used for food. My question is whether they =
could
be used on the outside, or in places on semi-functional pieces if the =
commercial
glaze were used on all possible places food could be put. Such as the 'bowl'=
and
lip of a piece commercially glazed and the sculpture glaze on the outside of=
the
vessel below the lip. (say the sculpture glaze starting 1/2 inch down)
Or would the fumes from the sculpture glaze contaminate the commercial =
glaze.
The toxic elements in the sculpture glazes are barium, lithium, and small
amounts of mason stains and copper carb. The commercial glaze is Amaco clear
fired cone 05.
And one final question, I have always fired once being basically cheap. How =
does
this affect the commercial glaze for toxicity?
Thank you for any and all input. I'm completely phobic at this point about
making any thing remotely functional.
Celia in NC where it finally rained the pastures look great and the horses =
are
happy. (Mainly cause I'm too busy to ride them.)
cwike=40conninc.com
John Hesselberth on wed 5 may 99
Hi Celia,
At Cone 05 I doubt that the metals you mention are going to migrate.
They can be used on the outside of functional vessels. The biggest
hazard is that, over time, you or someone else forgets that they are only
for the outside and begins to put them on the inside. I hope all this
discussion doesn't stop you from enjoying glaze formulation and
experimenting. Those of us that are concerned just want you and others
to think about what you are doing and learn some of the basics before you
do it instead of after. John
CNW wrote:
>----------------------------Original message----------------------------
>I primarily make sculpture but occasionally make pieces that could be used as
>food containers. I haven't used glazes in the past except for the commercial
>clear on the inside if pieces that could be used for food. Since this is
>pretty
>rare I haven't even gone through the first pint yet.
>
> However another sculptor and I have been experimenting with some wonderful
>colors that I know could NOT be used for food. My question is whether they
>could
>be used on the outside, or in places on semi-functional pieces if the
>commercial
>glaze were used on all possible places food could be put. Such as the
>'bowl' and
>lip of a piece commercially glazed and the sculpture glaze on the outside
>of the
>vessel below the lip. (say the sculpture glaze starting 1/2 inch down)
>Or would the fumes from the sculpture glaze contaminate the commercial glaze.
>The toxic elements in the sculpture glazes are barium, lithium, and small
>amounts of mason stains and copper carb. The commercial glaze is Amaco clear
>fired cone 05.
>
>And one final question, I have always fired once being basically cheap.
>How does
>this affect the commercial glaze for toxicity?
>
>Thank you for any and all input. I'm completely phobic at this point about
>making any thing remotely functional.
>
>Celia in NC where it finally rained the pastures look great and the horses
>are
>happy. (Mainly cause I'm too busy to ride them.)
>
>cwike@conninc.com
John Hesselberth
Frog Pond Pottery
P.O. Box 88
Pocopson, PA 19366 USA
EMail: john@frogpondpottery.com web site: http://www.frogpondpottery.com
"It is time for potters to claim their proper field. Pottery in its pure
form relies neither on sculptural additions nor on pictorial decorations.
but on the counterpoint of form, design, colour, texture and the quality
of the material, all directed to a function." Michael Cardew in "Pioneer
Pottery"
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