As it is usually itself adulterated with some fatty oil, it needs to undergo purification before use.
A little good mineral oil may with advantage be mixed with the fatty oil.
(1⁄32 grain) mercuric iodid (biniodid of mercury) dissolved in a fatty oil.
The saponification number and acid number are both very low, but a fatty oil is present.
fatty oil n.
A nonvolatile oil of animal or plant derivation, chemically a glyceride of a fatty acid, that is not capable of distillation and that is convertible into a soap by substituting the glycerine with an alkaline base.