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Lithographic tusche is available in three forms: stick, paste and liquid. Although the three are compounded of basically similar materials, each has subtly different characteristics. The stick and paste tusches are more flexible in that they may be used with water, turpuntine, or a petroleum solvent. Korn's Autographic Tusche ( a liquid tusche, brown in color) is especially good for linear work and solids. It dries fast, is thin enough in consistency to work easily with a pen, and prints a strong black. In general, tusche mixed with other solvents tends towards greater viscosity and penetrates more deeply into the stone. The image so produced, being more deeply seated, is richer and more resistant to etching than the image made with water tusche. As a result, solvent-tusche images have a tendency to print darker than they appear in the drawing.
Bron: The Tamarind Book of Lithography, page 34,