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Tag: optics

Optiks™: past, present and future

In this article, Malcolm Knight discusses the history, technology and status of the banknote feature termed Optiks™. The journey has not been straightforward and...

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Bulgaria introduces new leva banknote

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The Bulgarian National Bank (BNB) says it is putting a new version of the BGN 5 banknote with enhanced security features in circulation on...

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Spark orbital

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An optically variable ink changes colour and brightness, giving the impression of dynamic movement. A bright ring can be seen moving around a central...

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