If you’re looking for a nice easy eco-friendly craft project that helps reduce broken crayons why not make a heart crayon for your nearest and dearest. You can make these in the microwave or the oven.
1) If you’re using an oven preheat it to 250 degrees.
2) Peel all the paper labels off of your broken crayons and separate them by shades of colour – keeping oranges and yellows together, blues and greens together, and pinks and reds together. If you mix them all, it will turn out to be a yucky color!
3) Spray your moulds, muffin tins, etc. with cooking spray
4) You will need about 1 cup of broken crayons to make 12 larger crayons as I did. Oven: If you are using muffin tins/silicone moulds in the oven, fill your tins about 1/2 full of broken crayons, separated by shades of colour. Put them in the oven for about 8 min. You will need to remain close by and check in on them periodically because they will melt quickly.
5) Once your crayons have melted, take them out of the oven carefully, and then take a toothpick and swirl the wax around. Let them cool for a long time.
Microwave: If you’re using candy moulds or ice cube trays, which cannot go in the oven, then microwave the crayon pieces in microwave safe cups or bowls (separate the colour shades into different cups) for about 4-6 minutes. Then pour the melted crayons into your candy moulds or ice cube trays and wait for them to cool and harden. Be careful — once melted, the wax is very hot!
Thanks to petite planet for the original post.