Photochromic Ink
Photochromic inks change their colour when exposed to UV light. When the UV light source is removed, the colour change stays for a certain time before the colour reverts to its original state. Examples: Estonia: passport, Malta: passport (since November 2000).
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Photochromic inks change their colour when exposed to UV light. When the UV light source is removed, the colour change stays for a certain time before the colour reverts to its original state. Examples: Estonia: passport, Malta: passport (since November 2000).
Source : Click Here
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