Proofs of colours separation negatives that have been exposed to offset plates and printed using process inks. Presented in the sequence of printing, i.e., (1) yellow plate alone, (2) red alone, (3) yellow and red, (4) blue alone, (5) yellow, red, and blue, (6) black alone, (7) yellow, red, blue, and black. The preferred way for checking the colour of the separation negatives using the same inks, paper, ink densities, and colour sequence as intended for the production run.