'The wheel of industry', graphite pencil, gouache, coloured pencil.

“工业之轮”炭笔，树胶水彩，彩铅。

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Layers of graphene make up the graphite found in pencil lead.

铅笔芯里的石墨就是由多层石墨烯组成的。

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In 2004, Andre Geim at the University of Manchester made a pencil scrawl on a sheet of paper, then used a length of Sellotape to pull off the graphite deposits.

2004年，曼彻斯特大学，科学界安德烈·海姆先用铅笔在一页纸上乱涂，然后使用透明胶带剥离出表面的石墨烯涂层。

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Think of it this way: The graphite in a pencil and a diamond differ only in how their carbon atoms are arranged.

FORBES: Tiny Miracles

In one of such sessions, together with his doctoral student Konstantin Novoselov, he used a piece of ordinary sticky tape (which allegedly they found in a bin) to peel off a very thin layer of graphite, taken from a pencil.

FORBES: Research by Mucking About

Belonging to a class of worlds known as diamond planets, 55 Cancri e is thought to be rich in the element carbon, which can exist in a variety of structural forms such as graphite (the material used as pencil lead), graphene, or diamond.

BBC: Oddballs: The strange worlds beyond our Solar System