Thick Black Ink Used in Lithography

This page is the CodyCross answer for the clue below from Train Travel, Group 710, Puzzle 3 (Mountain Ranges).

Question is: Thick Black Ink Used in Lithography

and the answer is: TUSCHE

Word Meaning:

TUSCHE — A black liquid used in lithography for drawing and painting and in etching and the silk-screen process as a resist.

Definitions from Wiktionary.