Josh Starneslooks like some one started working on using invisible IR inks to make a invisible machine readable QR code
https://news.mit.edu/2022/invisible-labels-identify-track-objects-0128
Hmm MIT article
A project log for Invisible QR Code Navigation for Robots 2020
Cheap UV invisible QR codes for indoor navigation of robotics. Print labels from Inkjet Printer and read with a normal camera.
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