The proportions of these components depend on the hardness of the crayon. Shellack 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 eample tusche and lithographic drawing ink)
In the past, litho pencils were wrapped with paper. These are no longer made. Recently we were able to buy a batch of "old-fashioned" (paper wrapped) litho pencils. Available until end of stock. Korn once rejected them because they were damaged.