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Crayons are not only fun to color with, they're also great for teaching children about reversible and irreversible changes. This crayon melting project is a simple and creative science activity that involves an oven, some old crayons, and some parchment paper. The goal is to see which colors melt faster and which ones melt more evenly. You can use any brand of crayons, but popular crayons like the Crayola brand tend to work best.