CRAYON, a general name for all coloured stones, earths, or other minerals and substances, used in designing or painting in pastel; whether they have been beaten and reduced to a paste, or are used in their primitive consistency, after sawing or cutting them into long narrow slips. In this last manner are red crayons made, of blood-stone or red chalk; black ones, of charcoal and black lead. Crayons of all other colours are compositions of earths reduced to paste.