We are going to be experimenting with lemon juice as an invisible ink. When you use it to write on paper nothing will be visible but if you want to see your message all you need to do is heat your paper. When you do the carbon in the lemon juice reacts with the air and starts to turn brown.
To make your invisible ink the first thing that you are going to do is squeeze some lemon juice into a bowl and add a little bit of water. Give this a mix, and then you are ready to use it to write a message on your paper:
Leave your message to dry and it will stay invisible until you heat your message. It will then become visible. You could hold it over a lightbulb, iron the paper, put it in the over, or do whatever you want to heat the paper, but you may need an adult to help you.
There are other things that you can also use as invisible ink in the same way. Vinegar, Milk, Orange Juice, Soapy Water, Apple Juice and Honey also work in a similar way so you may like to experiment with some of these other things and see what works best!
The video tutorial for this experiment is available on Surrey Libraries Facebook page and Surrey Libraries YouTube channel.
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