In the article, I didn't see any information about what ink (and what printer type) can be used for this... any clue where such IR-visible inks can be found? E

In the article, I didn't see any information about what ink (and what printer type) can be used for this... any clue where such IR-visible inks can be found? EDIT: Actually, found it in the full "manual"! https://nettlep.github.io/magic/ https://nettlep.github.io/magic/ -- it's not a printer but rather a stamp... :-)