These were the crayons we used on our leaf rubbings the other day. My son used to take the paper off of all of his crayons before he would use them, so it made these super easy. We had so many old, broken crayons that I just broke them up and put them in this mini muffin tin. I put them in the oven on 250 degrees until they were good and melted. Put them in the freezer until solid and they will pop right out. The kids loved using these!