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What makes pencil lead hard?

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Anonymous

10y ago
Updated: 8/21/2019

The graphite used in pencils is quite soft. Clay is added to the graphite to strengthen the 'lead' of the pencil. The amount of clay used changes the pencil's rating, with HB being the commonest, B2 being softer (darker marks), and H being harder (lighter marks).

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Wiki User

10y ago

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