https://www.newindianexpress.com/nation/2022/may/31/colour-shifting-ink-security-fibres-newfeatures-to-makefresh-banknotes-counterfeit-proof-2460005.html
Colour-shifting ink, security fibres: New features to make fresh banknotes counterfeit-proof
A host of new security features are expected to be added when the RBI goes about printing fresh banknotes.
colour shifting ink