Mines

La mina es fa amb una barreja de grafit fi i argila que es cou en forns. El grafit és una forma de carbó, un dels minerals més tous. Es classifiquen mitjançant una graduació contínua descrita per "H" per la duresa, "B" per al grau de foscor i "F" per al grau de finor. El llapis estàndard per a escriptura és l'HB.

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