Paper Currency «Updated · PICK»

: Advanced security paper often contains watermarks, security threads (some with colour-shifting properties), and fluorescent fibres visible only under UV light. Printing Techniques :

: Promissory notes originated in 7th-century China during the Tang Dynasty to avoid carrying heavy metal coins. paper currency

: Designs visible only when the note is tilted at specific angles. security threads (some with colour-shifting properties)

I. Introduction