PRACTICAL SCIENCE TRICKS - INVISIBLE INK

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INVISIBLE INK

Many of you may have read about this one in the mystery novels for children. You can make invisible ink in three ways:

1. Squeezing a couple of lemons into an empty bowl.
2. Use a little milk.

If you have an ink pen, fill it with this newly created invisible ink. Alternatively, you can also use a cotton swab to serve the purpose of a pen. Take a blank sheet of white paper. Using the ink pen (or the cotton swab dipped in the liquid solution) write a few words on the sheet of paper. Wait for a couple of minutes after which you should hold the paper over a low flame. You will see the invisible ink darkening and you will be able to read the secret message!




SCIENCE BEHIND:
Both lemon juice and milk are mildly acidic and acid weakens paper. The acid remains in the paper after the juice or milk has dried. When the paper is held near heat the acidic parts of the paper burn or turn brown before the rest of the paper does.

ANOTHER WAY WITHOUT HEATING
3. Mixing an equal amount of baking soda and water. To read the secret message, submerge paper in a shallow pan of grape or cranberry concentrate

Explanation:
Grape juice has an acid that reacts with the baking soda. A different color appears wherever the secret message is written.

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