Ink composition for marking and authenticating objects
First Claim
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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Abstract
This aim of the invention is to develop an ink composition 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 ultra-violet range, so that when it is subsequently illuminated by a second light only emitting in a wavelength belonging to the visible range, it has a color different from that which it had, under the illumination of said second light, prior to illumination by said first light, said color also differing from that of the non-photochromic pigment or dye when the latter is illuminated by said second light.
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Citations
12 Claims
- 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.
Specification