1 - Watermark When the banknote is held up to the light, a
picture and the value of the banknote become visible.
2 - Security thread When the
banknote is held up to the light, a dark line becomes visible.
UV
Flouroescence:
Ultra
Violet inks are used in the printing process of the note.
The security thread and special colors of the note are visible
when the note is lighted by an UV light making the note difficult to
falsificate.