Cut half-width strips of the reference paper conforming to iso 2846-1 and the practical paper type for which the ink colour is to be established. The thickness of the latter paper needs to be roughly the same as that of the reference paper. Tape both paper strips in parallel on the sample holder or the sector of a laboratory printability tester. Using a blanket-covered printing forme and a process ink that conforms to iso 2846-1 produce a test print by following the test-print procedure specified in iso 2846-1 . the amount of ink transferred is then adjusted such that the printing, whenthe ink is dry, results in an ink colour on the reference paper that conforms closely to iso 2846-1. When the ink colour on the reference paper is considered to be correct, the ink colour on the practical paper type that was printed at the same time is then measured in several spots. The average is the recommended ink colour for that paper on to a reference paper strip and to print on it. Again, the criterion is the correct colour in the refence paper. In the same way, two-and three-colour overprints are made. It has to be borne in mind though, that the overprints in the wet-on-wet printing mode described in A.3 come closer to practical conditions.