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Is the pencil core poisonous?

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  The bases of the pencil lead is graphite and clay, and graphite is flaky solid metal luster, among them with carbon - carbon bonds, is van der Waals force between layer and layer, carbon - carbon bonds is very stable, it is difficult to destroy, this is also why diamond and graphite is composed of carbon, but the physical properties and the price difference is very big, nothing can destroy the carbon - carbon bonds in the human body, so must say pencil lead is safe (unless it is inside the clay) harmful to human health.

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