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HOW TO – Tuesday! Make an “Invisible ink printer”

HOW TO – Tuesday! Make an “Invisible ink printer”

HOW TO – Tuesday! Make an “Invisible ink printer” – Take A New Twist On Lemon Juice. By Mike Golembewski Lemon juice has been used as invisible ink for centuries. Messages written in lemon juice are invisible to the naked eye. However, when brushed with a mix of iodine and water, they become quite visible. […]

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Printer Spying?

I can has subtle spying? Here’s an Instructable from the Electronic Frontier Foundation about tracking codes printers add to documents they print. Readers of Make learned about this back in volume 6; now, we’ve got a convenient video to send our friends: Here’s the link to learn more on EFF’s site.

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