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In this method, you will be melting some old crayons into fun new shapes. If you are using a lot of crayons, you can save time later by sorting them into similar colors. This means that you put the yellows with the yellows and the blues with the blues. You do not have to group specific colors together, such as putting all of the "cornflower" blues together and the "goldenrod" yellows together.
Preheat the oven to 200F (94C). Consider separating the crayons by color.