Invisible Ink

Ever wanted to be a spy when you were a kid? Ever wanted to talk or write to your friends but never wanted your brother and sister to know what you said or wrote? Here is a really easy way to make some invisible ink so that your kids can do just that.

Supplies:
Lemons (or pure lemon juice)
cotton swabs (q-tips)
paper

In a small bowl, squeeze a couple of lemons taking out any seeds (you can also use bottled pure lemon juice). Using the cotton swabs, draw a fun picture on your paper. Let dry completely.

Using a heat source (like a lamp that has been on for a while, or a toaster or hair dryer) reveal the "secret" message/picture.

The heat turns the lemon juice a dark brown color.