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The best crucibles are made of a pure fire clay, mixed with

finely ground cement of oil crucibles, and a portion of black lead or

graphite; some pounded coke may be mixed with the plumbago. The clay

should be prepared in a similar way as for making pottery ware. The

vessels, after being formed, must be slowly dried, and then properly

baked in a kiln.

Black Lead Crucibles are made of two parts of Graphite and one of

Fire Clay, mixed with Water into a paste, pressed in moulds, and well

dried, but not baked hard in the kiln. This compound forms excellent

small or portable furnaces.