Offset ink is a specific type of ink used in conjunction with offset printing presses such as those used to produce letterpress or lithography prints. Such ink must be specially formulated to resist other chemicals it will come in contact with on the printing press. It is crucial that offset ink resist water-in-ink emulsification (e.g. repel rather than absorb water). It should also withstand degradation by the fountain solution which covers the non-printing areas of the engraved plate.
- Ford, P; Tuft, R (1988) . "Lithographic Inks". In Leach, R; Armstrong, C; Brown, J; Mackenzie, M; Randall, L; Smith, H. The Printing Ink Manual (PDF) (4th, Illustrated ed.). Wokingham, Berkshire, England: Van Nostrand Reinhold International Co Ltd. p. 314. doi:10.1007/978-94-011-7097-0. ISBN 9789401170970. Retrieved 11 October 2015 – via Society of British Printing Ink manufacturers Ltd.
..inks that are required to print full-strength colors
- Ainsworth, Mitchell, C., "Inks and Their Composition and Manufacture," Charles Griffin and Company Ltd, 1904.