Stannol kolophonium acid free rosin flux stannol 174081 p stannol kolophonium acid free rosin flux is an acid free flux suitable for electronics p p colophony also referred to as rosin is an amber coloured brittle glassy solid at room temperature and becomes liquid at temperatures of 80 to 100 deg c p p in practical use small amounts can be chipped off and dissolved in isopropyl alcohol ipa or it can be melted by gentle heat from a soldering iron the resulting liquid can then b