By the intensity of an ink, we understand its colour strength, which is the result of the concentration, nature and development of its pigment.

Although they are closely related, it should not be mixed up with the colour intensity of the printed film, as this latter is influenced by other aspects: transfer, speed, stock type, etc.

It is measured comparatively with a known concentration standard. For this purpose, each of the inks is degraded with a white ink and the difference in the intensities of each is evaluated.