Multicolor holograms using gelatin as the binder and method for producing the same
AssigneeCiba-Geigy Corporation
InventorsJames Doyle, David W. Butcher, John A. Clark
Life of this patent
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Abstract
Multicolor holograms using gelatin as the binder and having interference fringes lying in layers parallel to the substrate, the colors of which are visible by reflection in incident natural light, by treating the holographic material which has been holographically exposed and processed to produce a hologram therein, by applying to the selected areas of the gelatin which contains the interference fringes a solution of a compound which causes the interference fringes to separate permanently and produce a bathochromic shift in the replay wavelength.
Claims18
A method of preparing a multicolour hologram which uses gelatin as the binder having interference fringes lying in layers parallel to the substrate, the colours of which are visible by reflection in incident natural light, which comprises treating the holographic material which has been holographically exposed and processed to produce a hologram therein, by applying to the selected areas of the gelatin which contains the interference fringes a solution of a compound which causes the interference fringes to separate permanently and produce a bathochromic shift in the replay wavelength.
Dependencies are inferred from the claim text.