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[–] 5541608? 0 points 9 points (+9|-0) ago 

Not a serial number, but an encoded series of colored dots. It usually DOES contain a serial number but can also contain the time, date and size of the print job, which computer it came from (MAC address) and even the title. Thankfully its not every brand, or even all models sold by the brands. But it does appear to be the most common printers used by offices.

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[–] 5541639? 0 points 1 point (+1|-0) ago 

So I'm guessing black and white printers don't have this problem?

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[–] 5541655? 0 points 1 point (+1|-0) ago 

If you can find one its probably safe.