Full color printing with 'invisible' upconversion inks

What is it about?

We have developed a system for making invisible markings that become visible as full-color images when illuminated with near-infrared light. These images cannot be seen in room light, or when viewed under a UV lamp.

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Why is it important?

This advance has applications in document and product identification. We have demonstrated, for example, that data can be encoded and read in full-color QR codes.