Image reproduction

Details Image reproduction Image reproduction

1988-12-23

1990-01-16

Fisher, J. Reed

Printing

Multicolor

Processes

B41F 506, B41F 516

Patent

active

048935581

ABSTRACT:
A method of detecting the position of a feature, such as a register mark, in a color separation comprises printing the color separation on a substrate with an ink containing a pigment corresponding to the color of the separation and a dye which is detectable only when exposed to radiation outside the visible range. The printed color separation is exposed to the said radiation and the position of the feature in the printed color separation is determined by detecting radiation, such as fluorescence, from the dye.

REFERENCES:
patent: 3105908 (1963-10-01), Burkhardt et al.
patent: 3522432 (1970-08-01), Ortlieb
patent: 3536550 (1970-10-01), Von Hofe
patent: 4451521 (1984-05-01), Kaule

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