Holograms having a standard reference colour

Details Holograms having a standard reference colour Holograms having a standard reference colour

G - Physics

03

H

G03H 1/02 (2006.01) G01B 11/26 (2006.01) G03H 1/24 (2006.01) G06K 5/00 (2006.01)

Patent

CA 2137574

Holograms and diffraction gratings are described wherein the presence of a "key-colour" (Magenta) permits an observer to identify the position where all the other colours of the hologram in question can be univocally determined. Two set of spectra (50 and 70) are provided such that at a predetermined angle (13) a reference beam of incident white-light (10) illuminating the holo- gram or diffractin grating composition will cause the observer (11) to see the color "Magenta" which is to be used as a reference "key-colour".

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