Kindergarten: Mushroom resist paintings

I saw this lesson at Leon, pas sur les murs, a darling blog that you should definitely check out! It was super fun and easy. Students first drew a mushroom and colored it in with crayons. The only rule was not to use brown since the background would be brown. While I demonstrated painting over the crayon resist, we discussed why the watercolor wasn't covering the mushroom. This is where science kicks in! I simply explained that water and wax don't mix and crayon is colored wax.  "What's in watercolor?", I asked. "Water!" So with brown liquid watercolor, they painted a border and then gently painted over their mushroom and the background. The students loved seeing the mushroom appear and practically glow off the page!