Investigating secret messages is a really entertaining and interesting investigation for children of all ages. A great way to start is to see if the children can create invisible ink.
You will need:
- Blank paper
- Agents e.g. lemon juice, milk, water, apple juice, orange squash, lemonade
- Cotton buds
- Small pots (paint trays work well)
Explain that you are going to try to find out what makes the best invisible ink.
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