The avariety is infusible, but on heating to 50° C. is transformed into the aform. [Please select]
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Lime is so infusible that it is frequently employed for the materials of crucibles in which the highest melting metals are fused, and for the pencils in the calcium light because it will stand extremely high temperatures. [Please select]
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They also supply "hard" or "combustion" glass, but this is only used for special purposes, as it is too infusible for convenient working in the ordinary blowpipe flame. [Please select]
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