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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
  • ********************************************
    • 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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