A crayon is a stick of colored wax, charcoal, chalk, or other materials used for writing and drawing. A crayon made of oiled chalk is called an oil pastel; when made of pigment with a dry binder, it's simply a pastel. A grease pencil or china marker (UK chinagraph pencil) is made of colored hardened grease and is useful for marking on hard, glossy surfaces such as porcelain or glass. Wax crayons are commonly used for drawing and coloring by children. Crayons are a staple at most schools worldwi… (More on Crayon)