this post was submitted on 25 Oct 2023
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The reason this happens is to prevent counterfeiting money.
From Snopes:
Do Household Printers Leave an Invisible Tracking Code on All Your Printed Documents?
Mostly true.
What's True
Numerous brands of color laser printers leave coded metadata in barely perceptible yellow dots that can be used to trace a printed document to its source, a feature originally intended as a deterrent to counterfeiting currency with laser printers.
What's Undetermined
While a majority of laser printers are designed to produce this secret metadata, it is unclear exactly how many printing companies and models employ the technology.