Hot Rocks

7-10 year olds | half hour

Find rocks in your backyard and with a little heat and lots of crayon, transform them into vivid masterpieces!

What You'll Need

  • smooth, flat rocks
  • crayons
  • oven mitts
  • plastic cutting boards


1. Pick rocks from your backyard that are relatively smooth, even, and flat. You want a good painting surface.
2. Wash the rocks outside, removing all excess dirt and grime. Rub dry.
3. Put the rocks on a foil-lined cookie sheet.
4. Place in preheated oven (150 to 200 ºC works fine). Bake for fifteen minutes.
5. While in the oven, set up a rock colouring station for every child. Use a plastic cutting board and oven mitts to make sure the children don’t hurt themselves with hot rocks (adult supervision required).
6. When the time is up, take the rocks out of the oven. Place one rock on each cutting board.
7. Colour away! As you colour on a hot rock, the crayon wax melts, making vivid, smooth colours that look like a painting.
8. Let the rocks cool and display.

Fun Tip:

- Use glitter crayons for extra sparkle.

Tags: paints, outdoors

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