Improvements in the treatment of fatty oils

572,458. Fatty oils and sperm wax compositions. EVANS, E. A., ELLIOTT, J. S., and WAKEFIELD & CO., Ltd., C. C. Dec. 8, 1943, No. 20548. [Class 91] Fatty oils and the liquid wax comprising sperm oil contain a small proportion of a polycyclic aromatic hydrocarbon having at least 4 condensed rings combined in the form of a pyrene nucleus. The compounds may contain further condensed nuclei in any position and any of the compounds may be substituted in any position by other radicals such as alkyl or hydroxyl. The compounds specified comprise pyrene, 3 : 4 benzpyrene, 4<1>-hydroxy-3 : 4 benzpyrene, tetrahydrobenzpyrene, and 1 : 12 benzperylene. Mixtures of the compounds may be used such as coal tar "heavy oil." In comparison tests, anthracene and phenanthrene are mentioned amongst others. The provisional specification also includes the 3 isomeric benzanthracenes and the 4 isomeric benzphenanthrenes. The fatty oils specified comprise castor, rapeseed, seal, ground nut, whale, linseed, lard, coconut, cod and neatsfoot oil. Specification 490,018 is referred to.