Make invisible ink

Introduction

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Did you know that you can make invisible ink from lemon juice?

Follow these simple instructions and be a secret agent for a day.

Join the Grub Gang detective agency and write secret messages to your friends.

It's easy and a lot of fun too.

Getting ready

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You will need:

  • lemon

  • chopping board

  • knife

  • lemon juicer

  • plastic cup

  • cotton buds

  • white paper

  • lamp

  • iron (optional)

Step 1

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First, ask an adult to cut the lemon in half.

Squeeze the lemon with the lemon juicer and put the juice in a plastic cup.

Step 2

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Next, dip a cotton bud in the lemon juice and use it to write your secret message on the white paper.

Step 3

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Wait for the juice to dry so it becomes completely invisible.

Step 4

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Finally, ask an adult to help you heat up the paper by holding it near a hot light bulb (but not too close) until the message appears.

Another way is to ask an adult to help you iron the paper.

Make sure you don't burn the paper!

Did you know?

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Did you know?

Lemons, oranges, clementines, grapefruits and limes are all citrus fruits.

They count towards your 5 A DAY.

They are also a source of vitamin C which is good for your skin.

Can you name any other citrus fruits?

Back to Know it!