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Pencils are marked with a grading scale, represented by what?

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Pencils are marked with a grading scale, represented by what?
posted Oct 5 by Rajni

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F, H and/or B
The letter marks how hard or soft the graphite is or that it can be sharpened to a fine point. The pencil can be marked H (in steps of 1 - 9, indicating progressively how hard the graphite is and consequently how light a mark it leaves), HB, F (indicating that it can be sharpened to a fine point), or B ((in steps of 1 - 9, indicating progressively how soft the graphite is and consequently how black a mark it leaves).

answer Oct 7 by Balwinder
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