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What do 'H', 'HB', 'F', 'B', and 'E' stand for on art and architectural pencils? - Quora
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What does HB stand for on a pencil? Which HB pencil is the darkest? - Quora
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What does H stand for on a drawing pencil? - Quora
What do 'H', 'HB', 'F', 'B', and 'E' stand for on art and architectural pencils? - Quora
What is the difference between HB and B-type pencils, and when do I use them in a drawing? - Quora