Have you ever wanted to send a secret message to someone, or write your password down where nobody can find it? Here are some ideas on how to make invisible ink.
Make the invisible ink. Pour lemon juice into your ink well or small bowl. Vinegar also works as a less effective alternative.
Get an invisible ink pen. Try a cotton swab, a toothpick, fountain pen, or calligraphy pen. Dip it into the invisible ink.
Write your message. Draw a map to your secret treasure, write a love letter, or put the combination to your vault on the back of your business card.
Allow the ink to dry. As the ink dries your message will disappear.
Reveal your secret message. Heat the invisible ink to reveal your message. Try holding your message over a light bulb, ironing the message, placing it on a cookie sheet in a hot oven for a few minutes or holding it around 4 inches above a flame. The ink will allow the written message to burn faster than the paper, turning your secret message brown. Stop heating before your paper scorches.
This will work with Lemon Juice, Milk, Vinegar and Onion Juice.
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