With reference to Bi-luminescent security ink, consider following statements

1.  It can help in counterfeiting documents such as passports, packing fake medicines and counterfeiting currency notes. 
2. This newly developed ink emits red color at a frequency of 611 nanometers and green color at a frequency of 532 nanometers due to exposure to ultraviolet light. 
3. It has been developed by scientists from the National Physical Laboratory (NPL) of the Council of Scientific and Industrial Research (CSIR) and the Academy of Scientific and Innovative Research.

Select the correct statement.

The Indian scientists have developed a special safety ink that can help in counterfeiting documents such as passports, packing fake medicines and counterfeiting currency notes. This ink shows two colours when exposed to the light of a certain frequency.

• It has been developed by scientists from the National Physical Laboratory (NPL) of the Council of Scientific and Industrial Research (CSIR), New Delhi and the Academy of Scientific and Innovative Research, Ghaziabad. The study has been published in the Journal of Materials Chemistry-C.
• This newly developed ink emits red color at a frequency of 611 nanometers and green color at a frequency of 532 nanometers due to exposure to ultraviolet light. The red colour emits due to the fluorescence and the emission of green color is due to the phosphorescence effect.

By: Shubham Tiwari