For younger grades, start by reading the book Little Blue and Little Yellow by Leo Lionni to the class. (The Grovecrest Library has a copy of it.)
This is a cute little tale of two colors and the mischief they cause resulting in them becoming a new color!
Next up: color changing experiment. First, set up three clear glasses of milk on a table. Add a drop of RED liquid food coloring in one, BLUE in another, and YELLOW in the third.
Then explain secondary colors are formed by mixing two primary colors together. Add a drop of yellow food coloring into the already made red milk (making ORANGE); a drop of blue food coloring into the already made yellow milk (making GREEN); and a drop of red food coloring into the already made blue milk (making PURPLE).
If you have more ideas for color wheel lessons, please share with us!