Patent ID: 10207529

Abstract:
There is described a security element or document comprising a substrate (20) and at least a first dynamic-effect feature (100; 120; 121; 122; 123; 130; 135; 140; 150; 171; 181; 191; 200) provided on the substrate which includes a dynamic-effect component that is responsive to illumination stimulus of a selected excitation wavelength or wavelength band to produce an optical spectral response, which optical spectral response changes dynamically over an observable period of time between multiple color appearances (C, F, M; C1, M1) upon and while being subjected to the illumination stimulus. The first dynamic-effect feature is provided in a region of the substrate which is proximate or adjacent to at least one proximity feature (101, 102; 120a, 120b; 121a, 121b; 122a, 122b; 123a, 123b; 131, 132, 133; 136, 137; 141, 142; 151, 160; 172; 182, 183; 192; 201, 205, 206) provided on the substrate, which at least one proximity feature has a color appearance which is selected to enhance and/or complement at least one of the multiple color appearances of the first dynamic-effect feature.