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Is it possible to use real shells as molds for slumping small pieces of glass ?
Depends. Shells are calcium. Calcium slowly burns off in the kiln. Thus shells are not permanent moulds. The calcium has a tendency to stick to the glass, so needs batt washing.
My view – it is better to make a flexible negative mould, from which a positive can be made. This can be permanent or one use (you do have a master now)
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