Abstract
Thirty-five photocopy toners and copies processed from machines using the respective toners were collected from five manufacturers. Through infrared spectrophotometry. a spectral match between the standard toner powder and the toner extracted from the respective copied document was achieved. Also toners were categorized into 18 different groups, of which 7 included more than 1 toner. Further specificity was achieved using pyrolysis gas chromatography, in which the toners in the seven different groups were distinguished from all others. Application is foreseen in an infrared spectrophotometer library search for peak match or functional groups or both to identify the toner of a questioned document, or matching or eliminating the toner from a questioned document with standards from suspect machines with pyrolysis gas chromatography.
