Does "dustfree" school chalk contain any real chalk?
#106155. Asked by flem-ish. (Jun 07 09 11:58 PM)
School 'chalk' is not actually chalk. It is gypsum. Chalk is a form of calcium carbonate (CaCO3). Gypsum is a form of calcium sulphate (CaSO4). So no, it contains no chalk whatsoever. It does, however, contain gypsum.
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