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Ink composition for marking and authenticating objects

  • US 5,702,511 A
  • Filed: 01/25/1996
  • Issued: 12/30/1997
  • Est. Priority Date: 02/14/1995
  • Status: Expired due to Fees
First Claim
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1. Ink composition for marking and authenticating objects, comprising at least one non-photochromic pigment or dye, a photochromic pigment or dye and a solvent, the photochromic pigment or dye changing absorption spectrum under the effect of a first light emitting in a wavelength belonging to the ultraviolet range, so that when it is then illuminated and only by a second light emitting in a wavelength belonging to the visible range, it has a colour different from that which it had, under the illumination of said second light, prior to its illumination by said first light, said colour also being different from that of the non-photochromic pigment or dye when the latter is illuminated by said second light.

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