The diatomic phenol, metadihydroxybenzene, C6H4(OH)2.

Properties : Resorcinol occurs as colorless, needle-shaped crystals, having a faint, peculiar odor and a sweetish, followed by a bitter taste. It is very soluble in water (1:0.5) and in alcohol (1:0.4).

Action and Uses: Resorcinol is antiseptic, antizymotic and antipyretic. On account of the readiness with which it causes the formation of methemoglobin and the resulting danger of collapse it is seldom administered internally. It is sometimes given to check fermentation in the stomach. Applied externally it is astringent in from 1 to 3 per cent, solutions, and keratolytic in strong proportions, from 10 to 20 per cent.

Dosage: 0.125 gm. or 2 grains.