Polymetaal

Lithographic crayon, from Graphic Chemical, Stones Crayons, "Rubbing Ink"

Lithographic crayon is made of: Grease Wax Soap Soot Shellack 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. (here three 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)

The name "Rubbing Ink" is actually wrong, it is crayon in a tablet form. Rubbing Ink used as a type of shoe polish. With a piece of cloth the crayon is picked up and smeared on the stone. Rubbing Ink is ideal to use as a supplement to the chalk technique. Rubbing Ink will rarely be found uniquely on a print. It allows to make very subtle transitions and woolly tones. Used as a drawing crayon it allows to set up large surfaces. (Google translate)