Abstract
AbstractA very fine state of subdivision is necessary to obtain a high percentage extraction of pyrethrum flowers, but very fine powders present difficulties in orthodox apparatus, and a method of extracting material finer than 200 mesh is outlined. This method is assumed to give complete extraction and is utilized to assay the residues of pyrethrum flowers normally ground for industrial and for analytical purposes, which have been extracted in stages over a period of time, and an empirical equation is deduced enabling percentage extraction at any time to be calculated from constants determined for such powders.
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