tusche
noun
tu·sche ˈtüsh 
ˈtü-shə
ˈtü-shə : a black liquid used in lithography for drawing and painting and in etching and the silk-screen process as a resist
Word History
Etymology
German, from tuschen to lay on color, from French toucher, literally, to touch, from Old French tuchier — more at touch entry 1
First Known Use
1885, in the meaning defined above