saggar clay

saggar clay

[′sag·ər ‚klā]
(materials)
A fire clay of which the case is made that is used for the firing of porcelain and pottery. Also spelled sagger clay.
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For example, just behind the polished, 300 square metre studio space, one can watch oxen trot over saggar clay (and people digging out the manure) as it is prepared for throwing.