Ingredients:
Cola drink (diluted)
Honey (diluted)
Lemon, apple or orange juice
Milk
Onion juice
Soap water
Sugar solution
Vinegar
Some inks are developed by heat.
You could use a oven, blow drier or maybe even a fire. If it works it will probably turn brown. Adults need to do the heating!
I predict that none of them will work.
Ms S. put it under a heat thingy and this was the result:
The honey worked the best!
Next was the tea.
Then the coke.
The vinegar and the sugar water didn't work very well.
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