How to make Invisible Ink

Squeeze the lemons to obtain its juice
Use the juice as ‘ink’ by applying it to the brush or cotton bud and write on the paper.
When you are ready to read your invisible message, hold the paper up to sunlight, or even a light bulb.
The heat from its source will cause the writing to darken to a pale brown, which will enable you to read your invisible message.
When you are ready to read your invisible message, hold the paper next to a heat source or put it in direct sunlight for a while.
You can even try submerging it very gently into water. Once the paper dries, your secret message will be magically appear.

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