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"I need to print tracking dots on all of your documents because the government wants to know what you print."
100% this. You could only print black and white on that printer and you would still be low on cyan.
Aren't those yellow though?
Back in my middle school days I'd crank the DPI of my scanner to the max and take super detailed images of bills. It tried its best at printing them too, but you couldn't fool a person with them. Some kids did fool coin exhange machines with homebrewn bills though. These days I don't think you can even scan the bills and the scanner calls interpol / secret service etc. for even trying.
Yep they do.
In my community college we had an assignment to make a board game.
One student wanted to make a Monopoly-like game. One day police stormed the school library. That kid had tried to one-side print dollar bills.
Even though they were obviously fake representations, the presence of the dollar bills triggered alarms.
It's driven me to believe that the reason printers aren't open source, isn't only because of how difficult the engineering in print heads are, but also that printers must have certain protections like these alarams in place.