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Chalkboard Chalk is free of binding agents, and can easily be wiped off of a chalkboard. Never use chalk on a chalkboard unless the manufacturer recommends it for chalkboard use.
Drawing Chalk contains oils that act as a binder. Use drawing chalks on paper surfaces, and on sidewalks. They are not meant to be used on chalkboards. If they are used on a chalkboard, it may be difficult to remove all traces.
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