Process for printing multicoloured print images in RGB mode, in which three coloured printing inks are applied successively in the form of print area units to a substrate and solidified, characterised in that the printing inks each consist of a printing ink vehicle which has been colour-pigmented exclusively with interference pigments and a printing ink in each case comprises red interference pigments, green interference pigments or blue interference pigments, and in which print area units lying alongside one another and/or one on top of the other are formed from the three coloured printing inks and give rise to a multicoloured overall print image, in which yellow print area units are formed by successive application of the printing ink that comprises red interference pigments and the printing ink that comprises green interference pigments, where the red interference pigment and the green interference pigment each consist of a flake-form transparent substrate and a coating located on the substrate, where the coating consists of at least 85% by weight, based on the weight of the coating, of titanium dioxide and/or titanium dioxide hydrate, where the red interference pigment has a hue angle h u'v' in the CIELUV colour space system in the range from 1° to 7° and the green interference pigment has a hue angle h u'v' in the CIELUV colour space system in the range from 110° to 120°, and the interference pigments have the following saturation values in the CIELUV colour space system: red interference pigments S* u'v' ≥ 0.65, blue interference pigments S* u'v' ≥ 1.2 and green interference pigments S* u'v' ≥ 0.45 and the interference pigments have the following chroma values in the CIELUV colour space system: red interference pigments C* u'v' ≥ 33 blue interference pigments C* u'v' ≥ 50 and green interference pigments C* u'v' ≥ 30, the hue angles, saturation values and chroma values in each case determined in a separate, full-area coating comprising the respective coloured printing ink on a black substrate under the measurement condition 45°/as 25°. where the red interference pigment and the green interference pigment each consist of a flake-form transparent substrate and a coating located on the substrate, where the coating consists of at least 85% by weight, based on the weight of the coating, of titanium dioxide and/or titanium dioxide hydrate, where the red interference pigment has a hue angle h u'v' in the CIELUV colour space system in the range from 1° to 7° and the green interference pigment has a hue angle h u'v' in the CIELUV colour space system in the range from 110° to 120°, and the interference pigments have the following saturation values in the CIELUV colour space system: red interference pigments S* u'v' ≥ 0.65, blue interference pigments S* u'v' ≥ 1.2 and green interference pigments S* u'v' ≥ 0.45 and the interference pigments have the following chroma values in the CIELUV colour space system: red interference pigments C* u'v' ≥ 33 blue interference pigments C* u'v' ≥ 50 and green interference pigments C* u'v' ≥ 30, the hue angles, saturation values and chroma values in each case determined in a separate, full-area coating comprising the respective coloured printing ink on a black substrate under the measurement condition 45°/as 25°.