4.2.1 Prints for colorimetric evaluation
For each of the inks to be evaluated, a number of test prints shall be made using a printability tester, each
produced at a different ink film thickness in accordance with the conditions specified in ISO 2834-1. They shall
be made o n the reference substrate as specified in Annex A. The sample material shall be kept in the dark
under standard conditions of 23 C and 50 % RH. The range of ink film thicknesses produced shall
encompass that specified in 5.3. In cases where the approximate ink film thickness is known to result in the
closest match of the target colorimetric values, a minimum of three prints shall be made. Otherwise, a
minimum number of five prints should be made covering the full range of specified film thicknesses.
4.2.2 Prints for transparenc y evaluation
Test prints for transparency evaluation shall be produced b y printing the inks to be tested on a black substrate
using a printability tester. Measurements of the CIELAB values of the black substrate shall be made pr ior to
overpr inting. The black shall have a lightness (L*) less than 30 when determined in accordance with
ISO 13655.