Poon N L, Ho S S H, Li C K
Questioned Documents Section, Forensic Science Division, Hong Kong Government Laboratory, Ho Man Tin, Kowloon.
Sci Justice. 2005 Oct-Dec;45(4):187-94. doi: 10.1016/S1355-0306(05)71665-8.
Document examiners are frequently asked to determine whether or not a colour printout has originated from a particular inkjet printer. The printer can rarely be identified unless some unique defects or irregularities of the printer are present on the printout. However, it is possible to decipher the make and/or model of the printer by comparing the ink-profile of the questioned printout with that of a seized inkjet printer cartridge or from one in a database. This paper presents an overview of a systematic approach to characterising and discriminating the inks of different inkjet printer cartridges using thin layer chromatography (TLC) and high pressure liquid chromatography (HPLC) with multi-wavelength ultra-violet/visible (UV/Vis) detection. Ink samples from 23 different inkjet printer cartridges (including originals and substitutes) of different brands and colour printouts, printed by known printers were examined with newly developed chromatographic methods. Subsequently, a database of the ink-profiles was generated. The methods provide a useful tool for discriminating coloured inks in inkjet printer cartridges of different brands.
文件检验员经常被要求确定彩色打印件是否来自某一特定喷墨打印机。除非打印件上存在该打印机的一些独特缺陷或不规则之处，否则很难识别打印机。然而，通过将可疑打印件的墨水轮廓与扣押的喷墨打印机墨盒或数据库中的墨盒的墨水轮廓进行比较，有可能破译打印机的品牌和/或型号。本文概述了一种系统方法，该方法使用薄层色谱法（TLC）和带多波长紫外/可见光（UV/Vis）检测的高压液相色谱法（HPLC）来表征和区分不同喷墨打印机墨盒的墨水。使用新开发的色谱方法对来自23个不同品牌的不同喷墨打印机墨盒（包括原装和替代品）的墨水样本以及由已知打印机打印的彩色打印件进行了检测。随后，生成了一个墨水轮廓数据库。这些方法为区分不同品牌喷墨打印机墨盒中的彩色墨水提供了一个有用的工具。
