Abstract
Multicolor printing tests were performed by a single color offset press on several grades of paper to know effects of changes of printing intervals on qualities of prints. The tests on fine paper resulted that the longer the interval, the higher the printing gloss. On the contrary, the same tests on clay coated paper exhibited that the gloss rather decreased until an one hour interval, then, increased gradually and reached the initial value at a five hours interval.
The hue errors of fine paper tested above decreased first until a five hour interval, then, increased and finally recovered 50% of its initial value at prolonged intervals. In coated paper, the hue errors also decreased until an one hour interval, then increased and reached 150% of its initial value.
In the case of coated paper, the color of printed ink was closely related to the printing gloss as mentioned by F. M. Freucil. But, we recognized that the relationship does not fit the case of fine paper.
The printing gloss and the color of printed ink were decreased by increasing the printing speed.
Several qualities of general grades of fine paper in the market affect the color of printed ink. Among them, the most influential factor for the color of printed ink is the whiteness of paper which we proposed a new formula to evaluate.
