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Tag: Color-changing

Colour-changing afterglow protects banknotes

A team of chemists in China has discovered a single compound that has a colour-modified afterglow. According to Chemistry World, this technique could protect banknotes...

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Philippines’ new enhanced security banknotes

The Philippines’ central bank has launched new ‎PHP 50, ‎PHP 100, ‎PHP 200, ‎PHP 500 and ‎PHP 1,000 banknotes. The Bangko Sentral ng Pilipinas (BSP)...

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Optical effect of novel structural colour OVD

Optically variable devices (OVDs) display special visual effects such as colour-shifting and image-shifting representation. OVDs which are composed of microscopic structures are quite different...

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