» You can use an Egg white to make invisible ink. You only have to separate the white part of the egg from yellow, dip a crown pen or pointed feather in Egg white, and write your secret message. Because it's colourless, it can't be seen after drying.
» Only when you heat the paper, from hot iron or above a candle, the Egg white ink will discolor brown, and you'll be able to read it again.
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» Tip 1: Don't ever 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.
» Tip 2: Egg white invisible ink, not completely invisible, recommended ot use recycle paper.
