Action and Uses: Emollient, used as substitute for olive oil.

*Oleum Sinapis Volatile (Ol. Sinap. Vol.), Volatile Oil of Mustard, U.S.P. (Mustard Oil).—Produced synthetically or from black mustard seed.

Nearly insoluble in water; soluble in alcohol.

Action and Uses: Powerful irritant and rapid vesicant; employed as counterirritant dissolved in alcohol or fixed oils.

Linimentum Sinapis Compositum (Lin. Sinap. Co.), Compound Liniment of Mustard, N.F.—Volatile oil of mustard (3%), fluidextract of mezereum (20%) and camphor (6%) in castor oil and alcohol.

Uses: Complex and antiquated counterirritant.

Spiritus Sinapis (Sp. Sinap.), Spirit of Mustard, N.F.—Volatile oil of mustard (2%) in alcohol.

Uses: Rubefacient.

*Oleum Terebinthinae (Ol. Tereb.), Oil of Turpentine, U.S.P. (Turpentine Oil, “Spirits of Turpentine”).—A volatile oil obtained from the oleoresin of pine wood (turpentine).

Nearly insoluble in water; soluble in alcohol.