If oxide of copper is added to a glass mixture containing a strong reducing agent, a glass is produced which when first taken from the crucible is colourless but on being reheated develops a deep crimson - ruby colour. [Please select]
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If this dish is made in the fireless cooker, the mixture must be reheated when the vegetables are put in. [Please select]
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After a sufficiently large mass of glass has been gathered and reheated to a workable condition the blower begins his task. [Please select]
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The joint is then returned to the flame and reheated, rotating as before, shrinking to about the shape of _e_. [Please select]
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The whole of the end of the tube is now cautiously reheated and then cooled slowly to anneal it. [Please select]
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The whole bulb must generally be reheated and blown a little at the end of the process, and well annealed. [Please select]
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Such a joint must of course be carefully reheated and annealed. [Please select]
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