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Wednesday, January 11, 2012

Hot Rocks (Melting Crayons onto Stones)

If there's anything we have a lot of, it's crayons and rocks. So, J and I thought it might be fun to combine the two, to see what developed. To make these "hot rocks" you will need, clean rocks, a cookie tray, parchment paper, some wax crayons, a knife or cheese grater and an oven set to 200 degrees Fahrenheit.

First, we took a cookie sheet and lined it with parchment paper.

Next, J placed the rocks on the parchment - leaving some space in between each one.

Meanwhile, I used a sharp knife to create some tiny crayon slices. I started with a cheese grater but found the knife was much more efficient.

Once the crayon pieces were ready, J placed little piles of them on top of each of the rocks.

Here's her photograph of what one of the rocks looked like, before the tray went into the oven.

When all the rocks were covered with crayon bits, I put the tray in the oven (preheated to 200 degrees Fahrenheit). We left the rocks to "bake" until the crayon bits had melted - about 10 minutes or so.

After the melting was complete - I took the tray out of the oven to let them cool. Here's how they looked "fresh out of the oven".

And here's how they looked, about 20 minutes later - when fully cooled. 

We polished them up a bit - using an old rag. To keep them looking fresh, a coat of non-toxic sealer or even beeswax would do the trick.

Remember, you can find lots of terrific ideas for kids of all ages (Pre-K through collage) at www.KinderArt.com 

Keep creating!


  1. On my blog, I have posted a link back to this lesson. I hope you don't mind. jan


  2. I was wondering if it would work to heat the rocks first and then color them with the crayons? Maybe it would be too risky to have little ones trying not to touch the hot rocks...

    1. Hi Jennifer,

      I think you're right - it might be tricky to have the little ones near the hot rocks without getting hurt. Unless... you can have them wear oven mitts while they color.


  3. a pencil sharpener (the "old school" kind) works great to get the little shavings of crayons you need for this, and similar projects. many preschoolers/kindergartens could do this step independently and it would provide extra fine motor skill/hand strength practice.


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