What about LEMON JUICE?When you were a child, did you ever write a note to another child using lemon juice? This was an outstanding way to communicate secret messages to one another. As the lemon juice dried, it became invisible. Nobody knew what you had written, except the child for which you intended the secret note. This child was the ONLY one that knew if you heated the note (like holding it over a light bulb) the note that was written with the lemon juice became visible again. Try writing a note like this to your child. He or she will have a lot of fun with this type of encryption. NOTE: This is for kids that are older and know enough not to burn themselves on the heat source, and not to heat the paper so much that it will catch on fire.
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