Blackboard
Reusable writing surface / From Wikipedia, the free encyclopedia
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For other uses, see Blackboard (disambiguation).
"Chalkboard" redirects here. For other uses, see Chalkboard (disambiguation).
A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.