Dan Kohler, Kitchen Scientist, shows how to create invisible ink.

The Science of Invisible Ink - Home & Family

#1 Heat
-Paint on the paper with an acidic solution (milk or lemon juice)
-Use an iron or a hair dryer and reveal the message!
(Be careful not to hold the heat source over the same place. This could be a fire hazard)

#2 Light
-Mix vitamin B12 with vinegar
-Paint message and let dry
-Use a black light to reveal your message

#3 Chemical
-Paint your message with a Ph Indicator (can buy online)
-Reveal your message using a mixture of baking soda and water

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