Fake Notes Current Affairs - 2020
The Council of Scientific and Industrial Research along with National Physical Laboratory recently discovered a bi-luminescent security ink. The ink shall be used to counterfeit currency notes. Also, it shows two colours when exposed to light.
About the Ink
The ink is white in colour when placed under normal white light. When placed under Ultraviolet light, it turns red. Later it turns Green when the UV light is turned OFF.
The emission of red colour is due to fluorescence and the emission of Green colour is due to phosphorescence effect.
How is the ink made?
The ink produced by mixing two different colours namely green and red in the ratio 3:1. This mixture was hated to 400-degree Celsius. The high temperature turns the mixture into fine white powder.
The thermal treatment is provided in preparing the ink in order to ensure the colour pigments stick to each other.
The ink is also to be used in passports
Tags: Basic Science • CSIR • CSIR-NPL • Fake Notes • Passports
The Council of Scientific and Industrial Research (CSIR) and National Physical Laboratory (NPL) developed an ink to combat the problem of fake printing of passports and counterfeiting of currency notes. The ink has a new security feature o protecting itself against duplicity
Key facts of the discovery
The ink was produced based on single excitable dual emissive luminescent pigment. It was developed based on the concept of fluorescence and phosphorescence phenomena. Currently, the currency notes display only one color with the emission of wavelength. However, in the ink developed by the scientists features changes in pigment color after the notes are printed.
In ambient light the ink shows white color. When the ink is exposed to UV light, it turns red and when the UV source is switched OFF it turns green.
Why the new ink?
According to the annual report of RBI (2018-19), the risk of duplication of Rs 500 and Rs 2000 notes are higher. The report says that recently launched 500 rupees notes are accounted to 121% of duplication and Rs 2000 notes are accounted to 21.9% duplication.
Fluorescence and Phosphorescence
Both in phosphorescence and fluorescence the radiation is electromagnetic and is spontaneous.
In case of fluorescence, the radiation stops after the source is switched off. On the other hand, in phosphorescence, the glow continues for few hours.