If the precipitate settles readily, the supernatant liquor may be decanted through the filter paper, more water added to the precipitate and again decanted. [Please select]
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By this time the whole of the insoluble matter will be at the bottom of the cup, and the supernatant solution will be clear. [Please select]
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The mixture is then allowed to settle and the supernatant mixture drawn off and run to the glycerine evaporator feed tank. [Please select]
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Formalin was added to a portion of the supernatant in the amount necessary to make the final dilution 0. [Please select]
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When cold, he pours off the supernatant fluid, and repeats the boiling three times at least with a fresh portion of water. [Please select]
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By agitating glycerol with chloroform, fatty acids, rosin oil, and some other impurities are dissolved, while certain others form a turbid layer between the chloroform and the supernatant liquid. [Please select]
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Place the bottle in a quiet situation for a week; any precipitate of impurities from the carmine will subside; the supernatant "Bloom of Roses" is then to be bottled for sale. [Please select]
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