FIELD: marking facilities.
SUBSTANCE: to realize a method for photochromic marking and/or providing autencity to objects by applying photochromic ink and for preparing needed composition, bacterial rhodopsin and composition prepared therefrom are used. Such materials and compositions are applied on objects wherein low- and high-protection features are used, preferably in combination.
EFFECT: allowed optical detection of protective feature, which, when exposed to visible light, can be decolorized and washed.
23 cl, 2 dwg
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