Goshen College Clay Recipe

Clay Recipe

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updated October 2003

This is the recipe for the Goshen College stoneware clay body. We use it for stoneware fired to cone 8 to 11 with no problems

It also works okay for raku. For large raku pieces, add more sand or grog.

These are not percentages. These are parts by dry weight - not volume - we use pound
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Custer Feldspar 13 lbs. (this is a flux) (required to prevent quartz inversion stress)
Flint (200 mesh silica) 6 (to help glazes fit)
OM 4 Ball Clay 18 (highly plasticity - high temp)
- a Kentucy clay

Mix these three (above) with water to make a mush, then add the following to the mix

6-tile Kaolin 21 (for high temp firing)
- a Georgia clay
Goldart clay 14 (cheap stoneware that throws well)
- an Ohio clay
Hawthorn fireclay 10 (fairly plastic high temp clay)
- a Missouri clay
Grog 5 (opens - reduces shrinkage

Mix with as much water or previously mixed scrap clay mush as needed and let it age a week or more if you have the time.

Sometimes I like more brown iron spots.

For iron spots add 3 to 5 pounds per 100 of red "potters clay" from Edicott Clay, Box 17, Fairbury, Nebraska 68352. This works well in reduction firing at cone 8 to 10, but does not show in oxidation firing. This clay can be wedged in or mixed in from the start.

Marvin Bartel

Also see
Studio Potter article by F.H.Norton
"Clay: Why It Acts The Way It Does"

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