Terpin Hydrate is obtained by crystallizing the hydrate of the diatomic alcohol, Terpin, out from a mixture of alcohol, nitric acid, and rectified oil of turpentine.

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Solubility: H20, 1 in 200; C2H5OH, 1 in 13. Efflorescent in dry air. Terpin is said to lessen cough in bronchitis. Dose, 0.25 Gm.