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The dimethylglyoxime should not be filtered until the mixture has become perfectly cool, because dimethylglyoxime is slightly soluble in a warm acid solution.
Crude or discolored dimethylglyoxime may be used since the impurities remain in solution in the aqueous alcohol.
The solution of dimethylglyoxime in sodium hydroxide should not be boiled, since prolonged heating causes decomposition.
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