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Raisins and sundried figs may be treated in the same way. Unfortunately, most of our dried fruit is sulphured. Sulphurous acid fumes are employed, and you may be sure that this does the fruit no good. If you can get unsulphured fruit, do so.
Still, the extraction of hop-bitter acid from hops is a troublesome and thankless job, the petroleum ether taking up certain substances which add greatly to the difficulty of purifying the crystals. On the other hand, we can readily and quickly attain our object, if we employ for our original material fresh lupuline from unsulphured hops. The mixture is shaken up from time to time.
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