FIELD: physics.
SUBSTANCE: disclosed is a protective mark having a layer with a concealed polarisation image and a reflecting layer. The layer with the concealed polarisation image has isotropic and anisotropic regions; the layer with the concealed polarisation image is a dichronic light polariser based on organic layers of dichroic anionic dyes, and the layer with the concealed polarisation image has phase polarisation capability.
EFFECT: high level of counterfeit protection while providing a cheap and reliable method of authenticating marked articles.
26 cl, 4 dwg
Title | Year | Author | Number |
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PROTECTIVE MARK | 2013 |
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Authors
Dates
2015-03-10—Published
2013-11-12—Filed