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Boosted by kornel ("Kornel"):
revoluciana@chaosfem.tw ("🌈Lucy🏳️‍⚧️ | Revoluciana") wrote:

"Typically, each time you print, your printer creates a series of dots all over your printed paper using only the yellow ink. They're small and hard to spot with the naked eye, but they're much easier to see with a black light."

Side by side image of two close-ups of the same document with and without a black light shone on it. In the image with the black light, the dots are clearly visible, but don't seem visible in the one without the black light.