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Tag: crystal
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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Greece Has Begun Issuing a New Generation Passport
Greece has launched a New Generation Passport, with a new design and advanced security features. The Hellenic Police Headquarters, National Passport and Secure Document...
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Touch
Perceptible relief (in the form of shapes or symbols) added for the benefit of the visually impaired.
Touch consists of raised dots created by means...