Ink set, printed article, a method of printing and use of a colorant
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United States of America Patent
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Aug 9, 2005
Grant Date -
Dec 16, 2004
app pub date -
Aug 30, 2002
filing date -
Oct 31, 2001
priority date (Note) -
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Abstract
The invention relates to an ink set comprising a plurality of inks of a first and of a second group, having different colors. Inks of said first group comprise a visible colorant and an additional IR-absorbing compound (IR-taggant) which has an absorption peak at a predetermined wavelength in the near infrared. Inks of said second group comprise a visible colorant which has at the same time an infrared absorption peak at the same wavelength as that of the IR-taggant used in the inks of the first group. Preferred embodiment is a four-color process ink set comprising an IR feature.
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