Pencils are more than 500 years old...
that time,it is commonly used in taking marks on sheep . Inspired by this, graphite was cut into small pieces for writing and painting. Before long, king George ii got the graphite mine putting it as a royal patent.
In 1761, the German chemist Faber solved the problem :He ground graphite raw material into powder, rinsing it with water to obtain pure graphite powder.Then he added sulfur, antimony and rosin to the graphite powder.The mixture was then heated and solidified .finally,it was pressed into the shape of a pencil. This is the earliest prototype of a pencil.
Today, pencil are lead made of graphite or added pigment clay.As medium of painting,It is used for learning, office, engineering drawing, painting and all kinds of markers .It becomes one of the necessary tools.