“…THE course of an investigation of the yellowing of white paints and enamels (59), it became apparent that the final solution of the yellowing problem might be expected to come from a thorough study of the chemistry of the drying process of drying oils. Although a hypothesis had been advanced to explain the drying of oils on a purely colloidal basis (2,8,4,9,60,61,62,68), the opinion now prevails that the drying of fatty oils, with the probable exception of tung oil, must be preceded by a chemical reaction between oxygen and the olefinic compounds of the oils (16,17,87,40,48,52,58,58). 1 Received April 9, 1931.…”