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Lesson Plans

Re: Ceramics Question

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bryan (rekcets)
Thu, 04 Sep 1997 05:49:57 -0700

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Scott Harrison wrote:
> I teach Ceramics 3 periods a day at the high school level and have
> always fired our electric to cone 04 for glaze. I want to try firing to
> cone 6 and wonder if anybody out there has any suggestions on glazes,
> underglaze, or engobes. I am using a cone six red clay from Laguna. We
> also fire Raku in a small gas kiln. Thanks, Scott Harrison

Bisque fire your pots to ^06 and then for ^6 glazes try some commercial
glazes either pre mixed wet or dry. Try a good satin matt glaze and add
different colorants - 1/4% cobalt carb for light blue, 1/2% for med
blue, 2% copper carb for green, 2% iron oxide for tan, 4-6% for brown,
1/2% cobalt and 2% iron oxide for a warm blue, etc. Get any ceramic
book and look at the colorant addition chart in the back.
Many underglazes work well at ^6 and some are now designed to work at
high cones in colors that traditionally won't take the heat. Those are
pinks and purples. Cover with a clear glaze. You won't get a real red
at cone 6 however.
Try a majolica glazes and use underglazes or mason stains to create
designs on the freshly glazed surface.

Good Luck! Let me know how it works.

Anne Stecker
Howard Street Charter School
710 Howard Street SE
Salem, OR 97302

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