The visible spectrum is from 380-750nm, IR alone is 750nm - 1mm (or 1000000nm), so really far I imagine.
This doesn't help you as it's not colour, but a few days ago I found out that HP, of all people, make a toner tank printer that takes powdered toner https://www.hp.com/za-en/printers/laserjet-tank.html
Can this be used to "jailbreak" proprietary devices that use it?
This is interesting, unlike the heltec v3 it has PSRAM so can support store and forward.
Lost futures we finally created.
Unfortunately not, I don't use xitter but was linked there from reddit. I did make the main link an xcancel link if that helps.
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Most receivers already use GPS, GLONASS, Galileo and beidou.
For (genuine) leather, saddle soap or Renapur leather cleaner is probably your best option.
For non-animal-based materials an enzyme cleaner.
Worst case scenario, dye them black.
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Men in deprived areas live up to a decade less than affluent counterparts, report finds
(morningstaronline.co.uk)
Use the "manifold" engine, it's far, far, faster.