Disappearing Ink
Disappearing ink is surprisingly easy to make and can inspire children to incorporate it into 'Famous Five' type 'mysteries'. In a small empty pot - a yoghurt pot is ideal - mix together four drops of lemon juice, four drops of onion juice and 17 grains of granulated sugar - they really do need to be counted out! Children dip a cocktail stick into the solution to write a message on paper, pressing gently so they don't leave any indentations that would give their message away. The writing will disappear when dry but the messages can be revealed when the paper is held over a bright light bulb.
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