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Earth for moulding

Sheath maker’s earth or the one potters use to blanche the pots to make the lead flow better on it and to prevent the lead from soaking into them is very good to cast the hollow parts of what you want in relief. It releases better than plaster or sulphur which become hard once they have grasped on to the mould because earth sticks. It needs to be beaten vigorously so that it does not break. If the piece you want to mould is very large you can mould different parts separately. If you reheat it, it must be over a closed fire. One finds this earth at Le Fousseret, and in another place called Ox.