Glitter ink
"NOTICE: this list is no longer updated, as this type of stamp is no longer considered to be unusual."
Glitter ink contains shiny mylar (polyethylene terephthalate) that result in a printed image with a shiny reflective look. This ink is used to create special effects. The holographic glitter produces a more vibrant sparkling effect than normal metallic inks.
18-01-2008 - Ucraina / Ukraine
06-12-2008 - Australia  
09-09-2009 - Thailandia / Thailand: inchiostro glittering + inchiostro perlescente  
25-01-2010 - Finlandia / Finland: inchiostro glittering + inchiostro all'iriodin     
10-10-2010 - Thailandia / Thailand: inchiostro glittering + inchiostro perlescente    
15-11-2010 - Malaysia: inchiostro glittering
13-12-2010 - Malaysia: inchiostro glittering + UV spot varnish
04-08-2011 - Thailandia / Thailand: inchiostro glittering (perf + imperf)
15-11-2011 - Thailandia / Thailand: inchiostro glittering
27-03-2012 - Hong Kong: inchiostro glittering (francobollo in alto a sinistra)  
05-11-2014 - Malaysia: glitter foil
03-12-2014 - Malaysia: glitter foil
"NOTICE: this list is no longer updated, as this type of stamp is no longer considered to be unusual."