infrared invisible ink
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Ceres Infrared Absorb Invisible Ink For Inkjet Printers
Infrared ink is an ink used in inkjet printers. It's colorless in normal light, but you can see black in an infrared light. We have four bands of ink: 650nm, 775nm, 810nm, 880nm. You have to be in the light of the corresponding band to see the color.
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