FIELD: physics.
SUBSTANCE: protective element has a transparent or semitransparent base. The base has an authentication mark which creates a first optical pattern in passing light and looks like it has no patterns, transparent or semitransparent and colourless. In reflected light on a predefined and readily accessible background, it forms a second optical pattern and looks like it has a defined colour image, with the second optical pattern considerably distinct from the first optical pattern.
EFFECT: proposed protection element has high degree of protection from counterfeiting with easy authentication at the same time.
121 cl, 20 dwg
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