9H hardest
The more ink, the lower the hardness, the harder the clay
“H†is the initial letter of “Hard†in English, which stands for clay and indicates the hardness of the pencil lead.
The larger the number in front of the "H" (eg, 6H), the harder the pencil lead, ie, the greater the proportion of clay mixed with the graphite in the cartridge, the less pronounced the word is written and is often used for replication.
"B" is the initial letter of the English "Black" (black) and stands for graphite. It is used to indicate the softness of the pencil core and the obvious degree of writing. With "6B" as the softest, the blackest writing, commonly used to draw.
Ordinary pencil marking is generally "HB", and the marking of the pencil used to answer the title card is "2B".
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