I have seen several techniques for temporarily dying hair. I have personally found this one to be the easiest. I used to do this in my teenage years. It is very easy and quick too.
All you need is a bottle of mousse, food coloring, bowl and a spoon.
Spray mousse into the bowl
Add food coloring...
Put it in hair.
I pulled her hair up half way so I could do two colors.
Then all done. This is very simple and is guaranteed to be completely gone within two washes.
I hope you enjoyed this tutorial.
Note: If you or your child has blond hair and you add blue to her hair it may be green instead. Just take into consideration mixing colors