» You can use a lemon juice to make invisible ink. You only have to press the juice out of a lemon, dip a crown pen or pointed feather in it, and write your secret message. Because it's colourless, it can't be seen after drying.
» Only when you heat the paper, above a candle or an hot iron, the lemon juice ink will discolor brown, and you'll be able to read it again.
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» Tip 1: Never write the message on an empty page. people can ask questions that why would you want to send an empty page to someone. So make sure you write a message on it. Something harmless, that anybody may read.
» Tip 2: Lemon juice invisible ink, not completely invisible, recommended ot use recycle paper.
