Chalk, Chalkboard Dusters and Chalkboard Instruments
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Blackboard chalk is a substance used for drawing on rough surfaces, as it readily crumbles leaving particles that stick loosely to these surfaces. Although traditionally composed of natural chalk, modern blackboard chalk is generally made from the mineral gypsum (calcium sulfate). Our Chalkboard Instruments are robust and can last for many years of education and precision drawing on chalkboards.
