Colorimetric verification
In order to evaluate whether an ink complies with this part of ISO 2846, it is necessary to print a number of
In order to evaluate whether an ink complies with this part of ISO 2846, it is necessary to print a number of
samples, each of known ink film thickness, which adequately represent the range of ink film thicknesses
specified in 5.3. These samples may be prepared on a printability tester by running up a small quantity of ink
on the inking system, weighing the printing forme prior to printing and then printing the test sample on the
reference substrate. The printing forme is then re-weighed and the difference recorded. If the mass density of
the ink is known (which may be determined by weighing a known volume of ink) and the printed area is
measured, it is possible to calculate the ink film thickness applied to the paper from the difference in mass
before and after printing. The ink film thickness, s, may be calculated using the following equation: