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 ...

After all, they are both composed entirely of carbon atoms. The main difference between pencil lead and the sparkling gem, which are allotypes (different forms) of carbon atoms, lies in how these ...

Common mechanical pencils come in sizes to accommodate 0.5, 0.7, and 0.9 mm leads, but there are bigger and smaller ones available. Perhaps one of those really large drafting lead holders could be ...

A jury of leading brand-side marketers has been named to select the winner of The One Show 2025’s prestigious CMO Pencil ...