Alignable diffractive pigment flakes and method and apparatus for alignment and images formed therefrom

摘要: Diffractive pigment flakes are selectively aligned to form an image. In one embodiment, having a magnetic layer shaped facilitate alignment in field. another the include magnetically discontinuous layer. particular deposition of nickel on diffraction grating pattern produces needles along that allow resulting diffractive flakes. Color scans test samples show high differentiation between illumination parallel and perpendicular direction embodiment by electrical fields. other embodiments, special optical variable images described method produce them.