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Sea shells are made of calcium and thus can be used to make stoneware glazes. A good starting point is 30:30:30 shells:kaolin:flint or 60 Redart:40 calcium carbonate.
It is possible to calcine the shells to 1500F and then slake them in water. However slaking releases considerable heat and the quicklime produced is caustic and fairly soluble, it likely to produce a glaze with high shrinkage and associated crawling problems.
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XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Sea Shells" descrip="CALCIUM" searchkey="" loi="0.00" casnumber="">
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