Ink set, printed article, a method of printing and use of a colorant
AssigneeSicpa Holding SA
InventorsAnton Bleikolm, Pierre DeGott, Claude-Alain Despland, Edgar Müller
Life of this patent
Estimating the term…
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.
Claims22
An ink set for printing light absorbing indicia comprising at least two inks,
- each of said inks having at least one colorant, pigment or dye absorbing visible light,
- wherein the ink set has a first group of inks and a second group of inks,
- the inks of said first group including an additional taggant with a predetermined detectable wavelength dependent optical characteristic, and
- the inks of said second group having a colorant, dye or pigment with a detectable wavelength dependent optical characteristic which is at least partially similar to the detectable wavelength dependent optical characteristic of said taggant.
A printed article carrying a light-absorbing indicia, the indicia being printed with an ink set comprising at least two inks, each of said inks having at least one colorant, dye or pigment, wherein the ink set has a first group of inks and a second group of inks, the inks of said first group including an additional taggant with a predetermined detectable wavelength dependent optical characteristic, and the inks of said second group having a colorant, dye or pigment with a detectable wavelength dependent optical characteristic at least partially similar to the detectable wavelength dependent optical characteristic of said taggant.
A method of printing an indicia having a detectable wavelength dependent optical characteristic onto an article, the method comprising the steps of
- applying at least one ink having a predetermined colorant of a first group of inks and
- applying at least one ink of a second group of inks having a different color than the inks of the first group
- wherein the inks of said first group include an additional taggant with a detectable wavelength dependent optical characteristic and
- wherein the inks of the second group have a colorant with a detectable wavelength dependent optical characteristic at least partially similar to the detectable wavelength dependent optical characteristic of said taggant.
Dependencies are inferred from the claim text.