Infrared-absorbing mark printed matter

Details Infrared-absorbing mark printed matter Infrared-absorbing mark printed matter

1993-01-14

1994-11-22

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing superposed layers

283 88, B42D 1500

Patent

active

053662520

ABSTRACT:
An infrared-absorbing mark printed matter in which an infrared-absorbing mark is formed on a substrate by printing with an ink having high light absorptivity in the infrared region; the infrared-absorbing mark is covered up by smearing with an ink having high light absorptivity in the visible region and pervious to light in the infrared region to form a colored concealing layer; and on the colored concealing layer is formed a white concealing layer by printing with an ink containing a white pigment and an extender pigment of which at least part of the particles are those having an average particle size of 3 to 20 .mu.m.

REFERENCES:
patent: 4889365 (1989-12-01), Chouinard
JP2173890 (Abstract).
JP4131292 (Abstract).
JP3261596 (Abstract).
JP4239697 (Abstract).
JP3285966 (Abstract).
JP3190972 (Abstract).
JP3075198 (Abstract).
European Search Report.

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