A New Ink discovered by Scientists

An ink is discovered by the Council of Scientific and Industrial Research (CSIR) and National Physical Laboratory (NPL) to combat the problem of fake printing of passports and counterfeiting of currency notes. It has a new security feature that will protect against duplicity.

• The ink consists of single excitable dual emissive luminescent pigment. The development of the ink is based on the concept of fluorescence and phosphorescence phenomena. The developed ink has features of changing the colour of pigment after the notes are printed.
• The ink shows white colour in ambient light. It turns into a red colour when it is exposed to UV light and when UV source is switched off it turns into a green colour.