The leads of drawing pencils are made with ground graphite and a filler, and the ratio of one to the other determines what grade of hardness a pencil is.
The leads of drawing pencils are made with ground graphite and a filler, and the ratio of one to the other determines what grade of hardness a pencil is.
The type of filler used depends on the brand.
The “harder” grades (F – 6H) contain more filler, and the “softer” grades (HB – 6B) contain less.
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