. . "The microemulsion of claim 6 wherein at least one anionic surfactant is formula Rx B--SO3 M wherein R represents alkyl, x is 1 or 2, B is a biradical when x is 1 or is a triradical when x is 2 and which is derived from an aromatic moiety and wherein M represents hydrogen or a cationic counterion and wherein the total number of carbons in Rx is from 18 to 30." . .