Today I have been working on the deeper boxes - making moulds as well as casting and investing the waxes. In lost wax casting, the piece you want to produce in metal initially has to be cast in wax. Investing is the term used for the refractory mould that will then be cast around the waxes. It is into this investment mould that the molten metal is poured once the wax has been burnt out, leaving a cavity in the exact shape of the finished metal casting.
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