Sorry,
adamL,it's not easy to find the original post this talk from,but it' definitely true.
JkPwNsTeR,those labels are made with anti-counterfeit technology,just like the Chinese Yuan(Renminbi,RMB),if you put them under a purple light,you will see a fluorescence reaction.and the paper used printing them,maybe the same as which for printing RMB,is not glossy,you can touch and feel them.