Prime Color Lesson plus Bath Incentive

I have found an ingenious way to teach my son his prime colors while encouraging him to take a bath. My four year old son hates taking baths. He does not like water and fights us at most bath times. I actually got him excited to get into the bath by taking out the food coloring. After a quick correction, he should not eat the water just because it had food coloring in it, he jumped right in the bath. He did an experiment and saw hands on that blue and red make purple. I told him we would combine red, blue, and yellow in subsequent baths. My fingers are crossed that this can keep his interest and help him become more comfortable in the bath!