I have been teaching the kids how to mix secondary colors. Last week we did this project. I sprayed shaving creme into three ziplock bags, then added yellow/blue, blue/red, and yellow/red. The kids squshed them to make green, purple, and orange.
After the colors were mixed we dumped the shaving creme into a pan and swirled it around. Next the kids took white card stock and layed it on the mixture. I then wiped the creme of with a napkin, and this is the finished product.