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Some people used to use "Flowers of Sulphur" to make chamber casts. It is available, or was, from drug stores. However, it is polymorphic...as just at melting temperature, it will cool to a solid, but if heated too hot, becomes a rubbery, translucent form that would be too soft to get a good reading from. Better to use Cerrosafe; it is almost ideal for chamber casts.
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