The application of two organic alkaline reagent, tetramethylammonium hydroxide (TMAH) and m-trifluoromethylphenyltrimethylammonium hydroxide (m-TFPTAH), as the reagent for the identification of drying oil in the dried paint films with GC-MS is studied. Both two reagents showed good results for obtaining the Palmitic/Stearic ratios from various oils, comparing with the diazomethane methylation method, but TMAH required higher temperature for methylation. Therefore, m-TFPTAH seemed to be superior in the porpose, and is supposed to make possible to identify the drying oil from smaller sample with method than diazomethane methylation. -- CAL