This is a fun experiment that can be done with simple items from around the home.
You will need:
Here's what you do
What do you see?
You should be able to see the writing re-appear, in a brownish colour!
*If you don't have a table lamp that produces enough heat, you may have to get the help of an adult. With their help, heat the paper by running a warm clothes iron over it. This will also achieve the same result. In order to avoid creating stains, place a second piece of paper over the writing and run the iron over that one.
When you heat the paper gently, it doesn't get hot enough to burn.
But it does get hot enough to burn some of the chemical substances contained in the lemon juice! That's why the writing turns brown.
You can try the same trick with some vinegar, sugar dissolved in a little water, or even the juice from an onion.