In the majority of these cases, oils are the primary food material for the germinating embryo. Waxes Oils - liquid at room temperature, molecules are less saturated. Linoleic acid can't be synthesized by the body, hence is an essential acid in the diet. A way of grouping oils that reflects degrees of saturation is into drying, semidrying, and nondrying oils. - drying oil refers to the fact that oils with many double bonds tend to link together, forming polymers. A thin coat of these oils spread over a surface dries into an impervious coating.
Metals help the oils absorb oxygen after they are applied, resulting in hard films.
Latex Paints - made with alkyd resins, which are water soluble making for easy cleanup. Ashes formed an alkali that cleaved fatty acids from glycerol portion of the triglycerides of the lard. Vegetable oils also used in manufacture of adhesives, fabric softeners, plastics, and to a limited extent in cosmetics. Methods of Extracting Vegetable Oils Grinding with stones- one of earliest methods. Mechanized presses - Mid 1600's, the steam driven grinding press was developed.