For the beginner charcoal often gets a bad rap because of its messiness and the seeming difficulty of manipulating it. It is however a wonderful medium with amazing capabilities. The charcoal rub is intended to lay down a middle value that allows the artist to utilize efficiency in putting down charcoal in the shadow shapes and removing it in the shapes of light with a kneaded eraser. It is a reductive or subtractive process as well as additive.
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