Anti-Stokes ink
Security ink containing a component that fluoresces in the visible band of the spectrum when illuminated by infrared light with a wavelength around 900 nm. Special equipment is needed to see the effect. Sometimes also called up-convert ink.
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Security ink containing a component that fluoresces in the visible band of the spectrum when illuminated by infrared light with a wavelength around 900 nm. Special equipment is needed to see the effect. Sometimes also called up-convert ink.
Source : Click Here
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