L.B.
Hi B.,
Here is a fun experiment that my kids always liked even well after they "learned their colors" and not at all messy.
Make some ice cubes with water but mix in a few drops of a primary colored food color, making several of each color. After frozen, put 2 different colors in a ziploc bag and then start guessing what color the water will be as the ice starts to melt. It's really a neat experiment because as the ice starts to melt you can see the result and you can still see the 2 original colors in the ice.
You can also make some of the ice cubes deeper colors by adding more drops and then compare how the blended colors are different because of this.
Have a good spring break!
~L.