lithographic, lithographical

[Eng. lithograph; -ic, -ical.] Of or pertaining to lithography; done by lithography; printed from stone; used in lithography. lithographic-crayon, subst. A crayon used for drawing on stone for the purposes of lithographic printing. They are composed e entially of soap, wax, fat, and lampblack. and are cast in the form of little cylindrical sticks. These are fastened in a porte-crayon or quill in the ordinary way. The above constituents, with various additions of shellac, mastic, ., are fused together and finally set on fire. The longer the mixture bur us, the harder the product becomes; three or four grades are usually made.