COLZA OIL  , a non-drying oil obtained from the seeds of Brassica campestris,

var. oleifera, a variety of the plant which produces Swedish turnips . Colza is extensively cultivated in France, Belgium, Holland and Germany; and, especially in the first-named country, the expression of the oil is an important industry . In commerce colza is classed with rape oil, to which both in source and properties it is very closely allied . It is a comparatively inodorous oil of a yellow colour, having a specific gravity varying from 0.912 to 0.920 . The cake left after expression of the oil is a valuable feeding substance for cattle . Colza oil is extensively used as a lubricant for machinery, and for burning in lamps .