Pencils clack-clack-clack as they ... was found in England and quickly supplanted the lead used in earlier writing instruments; graphite made a darker line and was more erasable.

The pencil “lead” is actually a mixture of graphite and clay. More clay in the mixture makes the lead harder. A harder lead has a higher number. Pencils are numbered from 1-3 but most people use a ...

Pencils, erasers, ballpoint pens - it was ... of paper), or a wax layer on a piece of wood. Some styluses were made of lead, which became popular - but as the centuries rolled on, graphite found ...