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Heat treatment or rendering are used to separate the fat from the fatty tissue. The processes that follow rendering of lard are decolorization or bleaching, deodorization, dulling, plasticizing and packaging. In the manufacture of margarine both lard and oleo products are used. Cocoa butter is used in medicine. Sunflower seeds oil is used in cooking, salad dressing, margarine and soap, and as a drying oil in paints.