Forensic Examination of Inkjet Inks

Trevor Cornell, Chemistry (on right in photo)

Faculty Mentor: Dr. John Allison

              This summer I am investigating the composition of different inks used in popular inkjet printers, with special attention to the inks that utilize pigments as their color component. The main method through which this is being accomplished is analysis via a time of flight (ToF) mass spectrometer. The end goal of this research is to develop a repeatable method using ToF mass spectrometry to consistently and accurately identify unknown samples, with the intended real-world application being a method that can link a questioned document back to a suspect printer. Throughout this project, our group has gathered printers and examined samples from both dye-based ink cartridges and pigment-based cartridges. We have examined both pure ink samples taken directly from the cartridges, as well as printed pictures, which, upon microscopic examination, prove to be substantially more complex than they initially appear. In addition, we have attempted to separate and identify the components present in different inks. These components can include the colorant itself, surfactants, humectants, biocides, and protective resins. Since the program began, we have made a good deal of progress towards our goals, and in doing so, we have developed a much wider scope of interest in exactly what goes into inks in general, as well as how ink behaves when it is printed onto different types of paper.

Personal Statement

              Having the chance to conduct research with the Chemistry Department at TCNJ has been a fantastic experience. It has given me a much better understanding of how the scientific community works, and has given me the chance to make my own contribution as well. I first applied to the summer research program because I was looking for something different to try this summer, instead of trying to find a typical summer job. I was particularly interested in hearing about Dr. Allison’s research because of my own interest in forensic science. Being able to work with him on this project has been a wonderful learning experience. This has been my first venture into serious research, as well as my first experience with examining a forensics related problem. Part of what has made the research exciting, and at times frustrating, is that there is no set of instructions for what we’re trying to accomplish. In true experimental style, we’re taking ideas and running with them, without knowing  if what we’re doing is going to work or not. The uncertainty of the results is part of what makes the research exciting, because when things do turn out well, the sense of accomplishment is much greater than the feeling that results from following a set procedure. This summer research has also helped me to become more accountable for my work, and has helped me to improve my laboratory skills as well. It has been a great experience, and one that I would definitely repeat.