SECRET INK

Secret Messages with Lemon Juice. (My daughter's school project)

Lemon juice is great in lemonade, can be a garnish for foods but did you know you can write secret messages with it? What you need to do is just squeeze some lemon juice write your secret message on a pice of paper and then hit the paper up.

Problem/Solution

Chemistry could be a bit dull but if you turn it into a spy game then it is a different matter.