Bleached rapeseed and soybean oils were hydrogenated (190, 200, or 210degreesC) over (i) one new-generation 1% Cu catalysts (cf. E. Szukalska et al., Przem.Chem. 2003, 82, 406) and (h) two Sud-Chemie's catalysts. The chemistry of the hydrogenation (i) and (ii) reactions was similar. Linolenic selectivity, 6-8 and 10-23 for the resp. oils, much higher than the 1.1-2.5 reported for Ni catalysts, decreased as the reaction progressed. Amounts of unsaturated trans-acids' lesser with rapeseed than with soybean oil, were much lower than those reported for Ni catalysts. Saturated (stearic) acids increment was almost nil. Conjugated linoleic acid (CLA) was formed, 3.3 and 5.3% in the resp. oils; CLA rose as the reaction temp. was raised. When IV fell by 15 units, Cl-18:3 acids fell to < 1%.