The main component of pencil lead is graphite. In fact, the refill of a pencil is made of graphite and clay mixed in a certain proportion. For example, "H" is the prefix of "hard" in English, which stands for clay and is used to indicate the hardness of pencil lead. The larger the number before "h" (such as 6h), the harder the pencil lead, that is, the greater the proportion of clay mixed with graphite in the refill, the less obvious the written words, which is often used for copying. "B" is the prefix of "black" in English, which stands for graphite and is used to indicate the softness of pencil lead and the obvious degree of writing. With "6b" as the softest and blackest handwriting, it is often used in painting, while ordinary pencils are generally marked as "hb". The pencil label used to paint the answer sheet during the exam is generally "2b".
Graphite is formed by a chemical element carbon (element symbol C). In fact, it is the same as diamond, but the arrangement of carbon atoms is different, so it is non-toxic!
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