Appendix XI B2. Water-soluble Extractive

To 5 g of the powdered drug (710) add 200 mL of boiling water. Allow to stand for 10 minutes, shaking occasionally. Allow to cool, dilute to 200 mL with water and filter. Evaporate 20 mL of the filtrate to dryness on a water-bath. Dry the residue in an oven at 100° to 105° for 15 minutes.