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be extinguished immediately. The metal should be permitted to cool
until it begins to crystalize around ^the edge of the ladle, then it should
be poured into the impression, which has been oiled, through the smaller
opening of the ring. If a low fusing alloy is used it should be heated
over the flame until only a portion of the metal in the ladle is molten.

Fig. 87.

As soon as the mass becomes liquid it should be cast into the impression
by the same method as that employed for casting the inlay metal. In
either case the impression should be removed immediately from the
moldine and immersed in cold water. After the metal has thoroughly
crystalized the impression is removed from the model by making it plastic.
If small particles of the impression material adhere to the model these
may be removed by saturating a pledget of cotton with alcohol or chloro-

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