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Science & Tech.
Pradeep Kumar

27/10/21 12:00 PM IST

Non-toxic security ink

In news

Indian Scientist has developed a highly stable and non-toxic security ink from nano-materials that spontaneously emit light (luminescent) due to its unique chemical properties to combat the counterfeiting of branded goods, bank-notes, medicine, certificates, currency.

Issue

Counterfeiting of branded goods, bank-notes, medicine, certificates, currency, and other important documents is very common all over the world, and it has become a serious issue.

Details of new ink
  • Luminescent ink is generally used as covert tags to combat the counterfeiting.
  • Most of the security inks available today are based on luminescent materials that absorb a high energy photon and emit low energy photon, technically called downshifting, where covert tag is invisible under daylight, and it becomes visible under UV light.
  • However, these single emission-based tags are prone to replication.
  • To overcome this, luminescent ink with excitation-dependent luminescent properties (downshifting and upconversion) are advised.
  • This is because increasing the number of parameters required to decode the tag decreases the possibility of decoding and replication.
  • However, most of the materials reported recently for this purpose are based on fluorides which are less stable and highly toxic.
Source: PIB

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