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Optical security: Tunable-resonator upconverted emission color printing

May 14, 2019

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Scientists have demonstrated a new optical security element that not only combines microprints with invisible inks, but also makes them colorful.

from Top Technology News -- ScienceDaily http://bit.ly/2W5iyUB

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Optical security: Tunable-resonator upconverted emission color printing

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