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United States of America Patent
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Jan 16, 1990
Issued Date -
N/A
app pub date -
Dec 23, 1988
filing date -
May 12, 1986
priority date (Note) -
Expired
status (Latency Note)
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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.
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