Iridescent or pearlescent stamps
Iriodin® is the registered trademark of Merck company in a very special kind of pigments that give a pearly sheen. Natural mineral 'mica' is covered by a thin layer of metal oxides, such as titanium dioxide and iron oxide. Through an interplay of transparency, refraction index and multiple reflections, you get a variety of color effects, which otherwise exist only in nature: silver-white and gold interference and a shiny metallic effect, reflective and three-dimensional. due to these excellent visual characteristics, but also their numerous technical properties, Iriodin luster ink can be applied in different printing processes, for example on postage stamps, against forgeries. Iridescent or pearlescent pigments have become very common in the creation of luster effects in coatings. The use of this pigmentation, depending on the viewing angle, makes the optical illusion of depth, almost holographic, created by the provision of multiple semi-transparent particles and pearlescent pigments under the reflection of light. All this not only for decoration, but also to provide an important role in printing security, because these optical effects obtained from pearlescent pigments cannot be easily copied.
22-08-1995 - Gran Bretagna / Great Britain: trattato con inchiostro all'Iriodin 18-06-1999 - Austria: iridescente 22-05-2000 - Gran Bretagna / Great Britain: trattati con inchiostro all'Iriodin 06-02-2001 - Gran Bretagna / Great Britain: trattati con inchiostro all'Iriodin 14-10-2002 - Hong Kong: trattati con inchiostro all'Iriodin 17-06-2003 - Gran Bretagna / Great Britain: trattati con inchiostro all'Iriodin 01-07-2003 - Gran Bretagna / Great Britain: trattati con inchiostro all'Iriodin 28-11-2003 - Austria (p-stamp) alla maggior parte dei francobolli personalizzati è stata aggiunta una colorazione di sicurezza all'iriodin 04-10-2004 - Canada: inchiostro argentato perlescente 09-05-2008 - Finlandia / Finland: trattati con inchiostro all'Iriodin 03-09-2008 - Repubblica Ceca / Czech Republic: trattati con inchiostro all'Iriodin 05-11-2008 - Repubblica Ceca / Czech Republic: trattati con inchiostro all'Iriodin 02-01-2009 - Germania / Germany: trattati con inchiostro all'Iriodin 17-02-2009 - Gran Bretagna / Great Britain: trattati con inchiostro all'Iriodin 27-03-2009 - Ungheria / Hungary: iridescenti 'effetto seta' 09-09-2009 - Thailandia / Thailand: inchiostro perlescente + inchiostro glittering 25-01-2010 - Finlandia / Finland: inchiostro all'iriodin + inchiostro glittering 08-03-2010 - Finlandia / Finland: iridescenti 06-09-2010 - Francia / France: pellicola iridescente 10-10-2010 - Thailandia / Thailand: inchiostro perlescente + inchiostro glittering 29-03-2011 - Gran Bretagna / Great Britain: trattati con inchiostro all'Iriodin 06-02-2012 - Gran Bretagna / Great Britain: trattati con inchiostro all'Iriodin

 
 
 
 
 
 
 
 
 raffronto con esemplare da 2 sterline privo del trattamento all'Iriodin
 
 
 

 
 











