Yellow Dots of Mystery: Is Your Printer Spying on You?

Step 4 Magnifying glass or microscope method

Place the printed page under a microscope or look at it through a magnifying glass (ideally with a magnification of 10x or more). Even under normal ambient light, the dots are easy to see. We tried two USB computer microscopes (DigitalBlue and Dino-Lite), but any kind of microscope should work.