UPSC Current Affairs | Prelims and Mains Exam 4 March 2020
Security Ink CSIR-National Physical Laboratory has developed a bi-luminescent security ink. The ink glows in red and green colors when illuminated by two different excitation sources at 254 Nano meters (nm) and 365 nm, respectively. The ink was prepared in a batch of 1kg and given to Bank Note Press (BNP), a unit of Security …