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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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