tuschen.

1885 Lithographer & Printer 24 Jan. 114/1 By the term autography we designate..everything that is written with lithographic tushe on transfer paper in order to enable it to be transferred to the lithographic stone. We use the word ‘tushe’, for though specially coined, it has been adopted by the entire craft of lithographers in this country.

1912 W. C. Brown Pract. Textbk. Lithogr. iii. 26 The most useful of all inks for writing or drawing on stone come under the name tusche.

1940 R. Mayer Artist's Handbk. xii. 440 Lithographic crayons and tusche are always black, regardless of the color in which the final proof is to be printed.

1940 R. Mayer Artist's Handbk. xii. 460 (heading) Tusche-wash~out method.

1965 C. Zigrosser & C. M. Gaehde Guide to Collecting Orig. Prints iv. 49 The crayons used [in lithography]—and their liquid equivalent, tusche or lithographic ink—are made of a mixture of grease, wax, soap, and lampblack... Many technical manipulations are possible:..tusche effects with pen, brush, drybrush or spatterwork, [etc.].

1967 V. Strauss Printing Industry v. 274/2 If lithographic tusche is used as a painting medium [in serigraphy], glue can serve as blocking medium as it will be repelled by the fatty lithographic tusche which is, of course, water-repellent.