Security marking

Details Security marking Security marking

G - Physics

01

N

340/124.4

G01N 21/84 (2006.01) B41M 3/14 (2006.01) B42D 15/10 (2006.01) C09K 9/02 (2006.01)

Patent

CA 2004423

ABSTRACT A security mark has a photochromic compound covered by a controlled absorbtion layer comprising a saturable absorber. Light of a wavelength serbing to convert the photochromic compound is at low intensity absorbed by the saturable absorber. A photochromic compound converted by UV can thus be sunlight protected. At high intensities, the absorbtion of the saturable absorber drops to permit conversion of the photochromic compound

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