Definition of "ox-gall" [ox-gall]

• The bitter fluid secreted by the liver of the ox. (noun)

The Century Dictionary (Public Domain)

• "Each color, which must be ground very fine, is mixed in water and ox-gall, and sprinkled separately over the surface of the gum with brushes."
• "The ox-gall prevents the colors from mixing together on the solution, every drop being distinct."
• "When ink is to be used on parchment, or glossy tracing-paper, it will flow perfectly if a few drops of ox-gall be mixed with it; but on soft paper, or on bristol board, this will cause the ink to spread."