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Pencil Lead Is Not Called Pencil

Why does pencil lead lead pencil?

Now the pencil does not contain lead, but made of graphite and clay, the reason why this is called, is due to its historical evolution caused.

Ancient Greece and Rome have made lead rods of metal pencils. They are mostly conical, with other objects after leaving the traces of lead, used to mark the mark.

In the 14th century, there was a similar pencil in Europe.

In 1565, the United Kingdom began to graphite as a refill, hand-made the most original wooden pencil.

In 1662, Germany built the world's first pencil factory.

1790 ~ 1793, the French Kant used clay will be made of graphite refills, laid a modern pencil industrial base. In the pencil pen on the usually have a hardness mark, h said hard pencil, the greater the number of the front of the greater hardness: b that soft pencil, the front of the larger number of the more soft core. Hb is a soft and hard pencil, suitable for daily writing purposes.

Pencil lead does not lead, the main component is graphite.

As lead is written on rocks or walls, there will be black traces, so in ancient Greece and Roman times people use lead as a drawing and writing tool. In ancient China, written in silk and paper, if wrong, then lead powder modified, so there is a "pencil" in the classical, but with the modern pencil is different.

At the time of the fifteenth century, the graphite was found, and the people at that time did not know the composition of the graphite, and the graphite was "blacklead." In about 1492, the British began to use a pen made of graphite, It was not until 1779 that scientists knew that graphite was a form of carbon. "It was made of graphite and then mixed with clay and poured into two rounds of wood. In recent years, there was also a plastic pen.

In order to meet the needs of pencil refills in the graphite and clay can be used in a variety of different proportions of mixing, mixing ratio is different, the nature and purpose of the refill is also different. For example, as a sketch with a sketch need to be a little soft, black point; students write the work of the need to use a little hard, slightly lighter color. When we buy a pencil, pay attention to the label on the pen, where H stands for hard, F is firm, and B is bold. According to the information provided by the manufacturer, the various pencils are from soft to hard in the order of HB-B-2B - (*) - 9B-FH-2H- (*) - 9H, where (*) is between 2B and 9B or 2H and 9H between the code.

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