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 various private schools, until Michael Sachs, with whom he was always on terms of intimate friendship, appointed him principal of the religious school which had been opened in that city in 1854. At the same time Rosin gave religious instruction to the students of the Jewish normal school. In 1866 he was appointed Manuel Joël's successor as professor of homiletics, exegetical literature, and Midrash at the rabbinical seminary in Breslau, which position he held till his death. Rosin was the author of: He edited Michael Sachs' sermons (2 vols., Berlin, 1867), and Samuel ben Meïr's commentary on the Pentateuch, with