Pencil is a tool used for writing on paper or wood. Pencils leave behind a dark grey or black mark. In ancient Egypt, Greece and Rome pencils were filled with lead. Today pencils are filled with the so called pencil-lead. Pencils are produced by casing pencil-lead in wood or other artificial plastic. Crayons are produced in a similar way - a wooden or plastic casing hides inside colorful charcoal, chalk or other material. Pencils and crayons are used for coloring by children, artists-drawers or architects.
