Relevance: Prelims: Science and technology
Why in news?
- CSIR-National Physical Laboratory has developed a bi-luminescent security ink which glows in red and green colours when illuminated by two different excitation sources at 254 nano meters (nm) and 365 nm, respectively.
Key highlights:
- The ink was prepared in a batch of 1kg and given to Bank Note Press (BNP), Dewas, a unit of Security Printing Minting Corporation of India Ltd. (SPMCIL), New Delhi.
- The ink is found comparable to the standards that are in use.
- The formulation can be used to check the authenticity of passports, Government documents, tamper evident labels, identity cards, etc.
Facts:
- It will help in counterfeiting documents such as passports, packing, fake medicines and currency notes.
- It reflects two colours when exposed to the light of a certain frequency.
- It appears white in normal.
- When ultraviolet light is applied at a frequency of 254 nanometers, it emits red colour. But when ultraviolet light is switched off, it emits green colour.
- The red colour emits due to the fluorescence and the emission of green colour is due to the phosphorescence effect.
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