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Slate pencils contain calcium, which strengthens bones. It also removes the enamel coating from teeth. Consuming edible slate pencils could be a good option for those who suffer from calcium deficiency. A slate pencil was used to write on the slate board. It was made from a softer and lighter coloured stone such as shale or chalk. Usually, a piece of cloth or slate sponge was used to clean it and this was sometimes attached with a string to the bottom of the writing slate.