These structural colors form due to a phenomenon known as thin-layer interference between clay and graphite, which are the ...

Additionally, these pencils feature graphite lead, which is stronger than regular pencils, making them a favorite among ...

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 ...

The Graphite Pencil was discovered before 1565, when a deposit of graphite was discovered near Grey Knotts of Seathwaite in Cumbria, England. The locals being traditional farmers found that it was ...