in combination with glycerine is contained in most fats and fixed uils, particularly the latter, and when pure is a tasteless, odourless, crystalline body, of sp. gr. 08908, which melts at 140 C., and is very soluble in alcohol and ether. It absorbs oxygen from the air and turns yellow upon exposure. Upon saponification with alkalies it yields combinations in the nature of soft soap. The natural oils containing olein belong to the “nondrying” classthat is to say, they do not thicken, and more or less dry up upon exposure to the Nitrous acid converts oleic acid into a solid stereoisomeric modification known as elafdic acid.

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Definition of  OLEIC ACID