Look closely at the image for this story. See those tiny yellow dots, arranged in a faint grid?
They’re on every page you’ve ever printed using a color laser printer. And they contain more than most people ever knew to look for.
If you hold a blue LED flashlight over that page in a dim room, a pattern emerges. These are called Machine Identification Codes. Printer manufacturers started embedding them in the 1980s at the direct request of the U.S. Secret Service.
The goal was to catch counterfeiters. If someone printed fake currency, investigators could trace the bills back to the specific machine. It worked. And it never stopped.
🖨️ What those dots reveal
The yellow dot pattern encodes your printer’s serial number, the date the page was printed and the time down to the minute. Invisible to the naked eye. Fully readable by investigators with the right tools. In 2004, the Electronic Frontier Foundation reverse-engineered the code and published a complete decoding guide.
Their work confirmed every major brand participates. HP, Canon, Xerox, Brother, Epson. If you’ve printed anything on a color laser printer since the early 1990s, those pages carry an invisible fingerprint tied back to your machine.
Law enforcement uses it. In 2017, NSA contractor Reality Winner was identified after leaking a classified document to a news outlet. Investigators traced the printout back to her specific machine, using those embedded yellow dots.
🔦 What you can do
Inkjet printers don’t use this system. Only color laser printers. You can test this yourself tonight. Print any page on a color laser printer.
Hold a blue LED flashlight over the blank white areas in a dim room. Look for a faint grid of yellow dots. You’ll find them.
Your printer has been quietly filing reports on you for decades. You never got a copy. Yup, I know what you’re thinking. Someday, my prints will come.
🗣️ TEXT/POST THIS STAT: Every color laser printer secretly encodes your machine’s serial number, date and exact print time on every page you print. The Secret Service designed the program, and it never stopped. GetKim.com
📩 Send this to someone who has a printer at home or in a home office. Use the links below.