Lemon Juice Invisibility

Simon gave me another heads up on a way to hide image/text… Lemon Juice.

Then when looking at science for kids, trying to find emulsion paper, I saw the Lemon Juice invisibility. It gives you simpe instructions on how to do it but basically you just use lemon juice to create your text/image, which you obviously will not be able to see, until you hold a light to it, which heats it up and then you can view what you created in the lemon juice.

http://www.sciencekids.co.nz/experiments/invisibleink.html

Some websites are suggesting that it is quite hard to reveal the message and you have to heat the paper up alot. I am not sure how I will really be able to do this is the page is attached to the book and obviously I do not want it to be dangerous.

Other products you can use for invisibility:

  • baking soda
  • corn starch
  • milk
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