Rosin taken when melting it. It is soluble in alcohol, ether, benzene and chloroform. Rosin consists mainly of abietic acid, and combines with caustic alkalis to form salts (rosinates or pinates) that are known as rosin soaps. In addition to its extensive use in soap making, rosin is largely employed in making varnishes (including fine violin varnishes), sealing wax and various adhesives. It is also used for preparing shoemakers' wax, for pitching lager beer casks, and numerous other purposes such as providing backing surfaces to tin ware, copper ware, or even silver and gold vessels when embossing or engraving them (its
David Rosin David Rosin David Rosin (May 27, 1823 – December 31, 1894) was a German Jewish theologian from Rosenberg, Silesia. Having received his early instruction from his father, who was a teacher in his native town, he attended the yeshibah of Kempen, of Myslowitz (under David Deutsch), and of Prague (under Rapoport); but, wishing to receive a regular school education, he went to Breslau, where he entered the gymnasium, and graduated in 1846. He continued his studies at the universities of Berlin and Halle (Ph.D. 1851) and passed his examination as teacher for the gymnasium. Returning to Berlin, he taught in