No. 99 Industrial Zone, Huangtian Town, Qingyuan County, Lishui City, Zhejiang Province, China
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You use pencils every day, but have you ever noticed the symbols on them?
You use pencils to write every day, but have you ever noticed the symbols on them? What do they mean?
Pencil grades are usually marked with the letters H and B. H stands for "Hard", indicating the hardness of the pencil lead, while B stands for "Black", referring to the darkness of the mark. The higher the number before H, the harder the lead and the lighter the line it makes. The higher the number before B, the higher the graphite content, the softer the lead, and the darker and more intense the mark it produces.