What are the differences between oil pastels and soft pastels?

Here are some of my feelings about oil pastels and soft pastels.
They have both equal merit. The stick of pastel is a linear agent and coloring instrument combined. What do they contain?
Oil pastels: pigments, wax. As they are non-toxic, they are used in schools. Sometimes the colors have no good light resistance.
Soft pastels: pigments, a little kaolin, gum arabic.

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