| Titre : |
Diffractive pigments help document security |
| Type de document : |
texte imprimé |
| Auteurs : |
Alberto Argoitia, Auteur ; Sean Chu, Auteur |
| Année de publication : |
2004 |
| Article en page(s) : |
p. 32-35 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Diffraction
Holographie
Magnétisme
Pigments
|
| Index. décimale : |
667.2 Colorants et pigments |
| Résumé : |
The concept of printable holograms is appealing for document security because these devices cannot be replicated by computer scanning, colour copiers, photography, or other commonly-used forgery techniques. Printable holograms can be created by combining existing technologies in thin film and diffractive interference with pigment design and a novel application of simple magnetic field theory. Further security enhancements are possible by incorporating other overt and covert features like optically variable pigments, fluorescent pigments, dyes taggants or by including specially shaped flakes as part of the overall pigment design. |
| Note de contenu : |
- Oriented flakes contribute to the diffractive
- Lowest energy is achieved when the particles are oriented
- Magnetic diffractive pigments preparation
- Design 1 created a bright silver coloration
- Optical characterization and the orientation of diffractive piments
- Agreement of experimental data and theory
- Red to gold optical design changed colour trajectory
- Diffractive optically variable image devices for security
- Combining features to achieve extra security
- Concept of printable holograms is appealing
- Table 1 : Grafting foil stustrate used in this study |
| En ligne : |
https://drive.google.com/file/d/15y9QYqA0I7BCSNSEAUIDdEpPSAC-VeST/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40659 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 11/2004 (11/2004) . - p. 32-35
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