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Printer's ink, even though a subsidiary invention, was a completely new development. Unlike ink applied with the pen, printing ink had to be highly viscous, rather like a thick paste.
Bloy, Colin Henry
A History of Printing Ink, Balls and Rollers 1440-1850 (London: Wynkyn de Worde Society, 1967). Available locally, Drexel University. TP949.B55
Available locally, Chemical Heritage Foundation. TP949.B69 1972
Available locally, American Philosophical Society Library. 655.32 B62H
Dane, Joseph A.
“Two-Color Printing in the Fifteenth Century as Evidenced by Incunables at the Huntington Library,” Gutenberg-Jahrbuch 74 (1999) 131-145
Van Pelt Library. Z1008.G98