SPECTRAL DENSITY VARIATIONS IN MULTICOLOR PRINTING

摘要

A multicolor printing method for reproducing varicolored images on substrates having a white surface by printing with inks of three primary colors, i.e. a color absorb blue (cab) which is a yellow, a color absorb green (cag) which is a red-violet and a color absorb red (car) which is a blue-green, producing printed colors having spectral density curves passing through matching ranges of optical densities at characteristic wavelengths in the visible spectrum, the ranges being within the following parameters: }Range of Optical density in % of Dmax }Wavelengths cab cag car }407 to 423 nm 65 to 93 2 to 27 39 to 79 }453 to 456 nm 89 to 101 10 to 25 12 to 25 }492 to 496 nm 60 to 74 65 to 81 1 to 10 }538 to 541 nm 4 to 14 88 to 103 13 to 25 }584 to 591 nm 1 to 3 50 to 75 65 to 88 }633 to 646 nm 1 to 3 1 to 4 84 to 109 } Dmax marking the range of the maxima of the three spectral density curves, which is spaced from the optical density of the white surface DO by a distance corresponding to the density of the solid areas obtained by printing with normal inking.