Liquid toners are an entrenched part of the many methods by which people communicate or display information but they have a relatively short history in the timeline of the printed word. The following review of this history covers a wide variety of commercial product and technical introductions and describes the innovative features of several. However, due to limitations of time and space, this paper cannot include all the contributions to liquid toner imaging.
Charles E. Case, Terence M. Lawson, "History of Liquid Toner Innovation" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP14), 1998, pp 226 - 230, https://doi.org/10.2352/ISSN.2169-4451.1998.14.1.art00056_1