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The original was posted on /r/todayilearned by /u/RopeAdop on 2024-04-19 20:40:11.

Original Title: TIL that the reason printers refuse to print without yellow ink is because they print a Machine Identification Code on every page, leaving a unique microscopic pattern of yellow dots that say what the serial number and model of the printer is, allowing the documents to be traced back to the owner.