Simply mix baking soda and water to make a paste. The easiest way for younger children is to make invisible ink with baking soda and water. Keep an eye on the paper so it doesn’t catch fire! This may be best if working with young children. You can also try putting the paper in a 350 degree oven for 2-3 minutes. We found that slowly moving the paper in small circles worked best. Be sure to keep it several inches away from the flame to keep the paper from catching on fire or scorching. To make the message reappear, carefully hold it over the flame of a lit candle. Let the paper dry completely, approximately 1 hour. (As an alternative you can also use milk.) Dip a cotton swab into the liquid and write your message on plain white paper. Simply pour a little lemon juice into a small bowl. My favorite way to make invisible ink is with lemon juice. There are lots of ways to make your own invisible ink at home. (We were surprised to discover that invisible ink was actually used by Washington’s spies during the Revolutionary War.) DIY Invisible Ink Once your kids have the hang of writing messages in code they can try writing them in invisible ink. They will need the second copy of the code in order to decipher the secret message. Use the numbers to write your own secret message, separating each number with a comma to make it easier to decode. The numbers will represent the letters of the alphabet. Make 2 copies of your new code, being careful that they are numbered the same. Write the number 1 next to that letter and continue numbering the letters 1-26. To create your own code, write the letters of the alphabet down a piece of paper. Your kids can have fun sending messages in their own secret codes. (They would have used a homemade quill, which you can also try.) George Washington’s spies wrote their messages in secret code to keep the British from knowing their plans. We couldn’t wait to try out a few secret spy activities of our own. Reading about George Washington’s spy ring while we studied the Revolutionary War kicked our interest into high gear. That’s why play kitchens, plastic tool sets, and cardboard box castles are always big hits with little ones.įor older kids who are into pretending to be spies, here are a few simple kids spy activities to take that play beyond just hiding behind that living room chair. Playing spies has become a new favorite for them. “Shhhh!” I heard her whisper to her brother. Hiding behind the reclining chair, notebook in hand, my daughter peered out.
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