This section is from the book "A Text Book Of Materia Medica, Being An Account Of The More Important Crude Drugs Of Vegetable And Animal Origin", by Henry G. Greenish. Also available from Amazon: A Text Book of Materia Medica : Being an Account of the More Important Crude Drugs of Vegetable and Animal Origin.
The oil expressed from the seeds of Brassicasinapioides, Roth, and of Brassica alba, Boissier. (Compare ' Black Mustard Seeds.')
Brownish-yellow; specific gravity 0.914 to 0.920; congealing point - 17°; iodine value 96 to 110 (black mustard) or 92 to 97 (white mustard). Constituents similiar to those of rape oil; used as a mildly stimulating embrocation; also for lubricating, burning and soap-making.