Lithographic crayon is made of:
Grease
Wax
Soap
Soot
Shellac
The proportions of these components depend on the hardness of the crayon. Shellac is not present in the greasy and soft crayons. Lithographic crayon is normally available in five different hardnesses. The lower the number, the greasier and the softer.
The crayons are used to draw the image on a lithographic stone (apart from for example tusche and lithographic drawing ink)
