Do you have a message you want to send your friend? Try writing it with invisible ink!
You will need: lemon, saucer, water, teaspoon, Q-tip, white paper, and lamp.
- Squeeze the lemon juice into the saucer.
- Add a few drops of water and mix well with a spoon.
- Dip the Q-tip into the lemon juice mix. Not too much or you’ll make invisible blobs!
- Use the Q-tip to write a message on ordinary white paper. Thick paper works best.
- When it dries the writing will be invisible.
- Heat the paper by holding it with the written side down near a light bulb.
What Happens: While it heats up, the invisible ink writing slowly becomes brown and visible. The words appear on the page.
Why:
- The juice of lemons has compounds of cardon.
- These compounds have almost no color when you dissolve them in water.
- When you heat them, the carbon compounds break down and turn black.