is expressed by pressure from flax seed, and is largely used in making paints, varnishes, linoleum, patentleather lacquers, rubber substitutes, and soft soaps, while the residual cake is used for feeding cattle. The cake is known to contain hydrocyanic acid derived from a contained glucoside, but most of it is dissipated during the maceration of the seeds and by evaporation. Linseed oil has a sp. gr. of o932 to 0938, a saponification value of 185 to 195, and iodine value 171 to 200. It contains linoleic acid is said to accompany the linoleic acid as a constituent of the oil. A published description of linseed oil is to the effect that it consists of 85 to 90 per cent, liquid glyoer ides, containing about 5 per cent, oleic acid, 15 per cent, linoiic acid, 15 per cent, linolenic acid, and 65 per cent, isolinolenic acid, the remaining 10 to 15 per cent, being made up of glycerides of solid fatty acids, chieily paln itic. When first expressed, the oil is pale yellow and not dis agreeable in smell, but unless it is reiined it quickly turns rancid, dark in colour, and repulsive in odour. It is soluble in alcohol, chloroform, carbon disulphide, benzol, and turpentine. Heating alone, under pressure, at a constant temperature greatly increases the viscosity and the iodine value decreases, while the saponification value remains unchanged. When boiled until it loses oneeighth of its weight, it thickens, becomes viscid, and dries quickly upon exposure to air. The oxidation of linseed oil by a current of aii is facilitated by the use of a little manganese dioxide or other drier, and this process gives “body” and drying properties to the product. Saponified with alkalies, linseed oil gives soft soap of a thin character. Supplies come front many places, and Argentine has about 3,500,000 acres of flax under cultivation. Linseed yields bj pressure aided with heat, about 27 per cent, of linseed oil.

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Definition of  LINSEED OIL