At the back side, the '50' is printed in a special ink that changes color when you change your viewpoint.
Well, I noticed that on the 50EUR bills of every country except France, the letters are really 'sharp'.
But on the French bills it looks rather 'blurry'.
(I hope you know what I mean, I'm not that good at expressing myself that good in English
The difference is very good viewable.
Just take a French and another 50€ bill and you see it.




