| http://www.w3.org/ns/prov#value | - However, it is generally less desirable to use lower alkyl esters of highly unsaturated fatty acids, for example, derived from the so-called drying oils" such as linseed oil, because they tend to oxidize and become discoloured during the process of the invention, and the product has relatively inferior surfactant properties; in general, it is preferred to use lower alkyl esters of acids containin
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