When I saw this project on Pinterest and knew that I had to try it. It's really simple. All you need is a glue bottle, food coloring, a willing kid, and a piece of paper.
Open up the glue bottle, put it a couple of drops of your color of choice, close the lid, shake, shake, shake, and hand it over to the child (with some instructions about keeping it on the paper, of course).
This is what it looks like wet. Once it's dry, it makes a really pretty dark glossy color.