Home > DIY, Fun, Hacking, Hardware, Information Technology, Printer, Technology > Make Your Printer Print in Invisible Ink

Make Your Printer Print in Invisible Ink

“Online readers who are secret agents—or secret agent wannabes—will love this project, which comes to us from MAKE Volume 16.

By replacing the ink in a color inkjet cartridge with concentrated lemon juice, you can print with invisible ink.

The secret message is revealed by spraying or wiping the paper with iodine tincture.”

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  1. November 13, 2011 at 5:48 am

    This amazing and very innovative. I’m hesistant to try though, would the lemon juice concentrate damage your printer?

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