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A Nondestructive Discriminating System for Writing Inks
XU Che;YANG Xu;FENG Zu-ru XI Jian-hua;SHI Shao-pei;BIAN Xin-wei;QIAN Huang-gui;SUN Wei-long(.Institute of Forensic Sciences;Ministry of Justice;Shanghai. China;. Shanghai Institute of Organic Chemistry;Chinese Academy of Sciences;Shangha
2005(06):
14-18.
A nondestructive discriminating system for writing inks was set up, which includes three approaches of microspectrophotometry, video spectral comparator and Fourier transform raman spectroscopy. 201 writing inks with different manufacturers, brands and models were collected from Chinese markets and divided into 7 groups, i.e. 35 black fountain pen inks, 20 blue-black fountain pen inks, 22 blue fountain pen inks, 49 black fluid pen inks (roller ball pen inks), 30 blue fluid pen inks, 45 black ball-point pen inks, and 50 blue ball-point pen inks. These inks were examined by the three approaches and the results showed that: 1. Inks in each group can be distinguished to a certain extent by each of the three approaches. The range of discriminating power is 50% to 94.4%; 2. Based on the results of the three approaches, the combined discriminating power for 7 groups is 93.4% for black fountain pen inks, 97.3% for blue-black fountain pen inks, 99.1% for blue fountain pen inks, 94.1% for black fluid pen inks, 97.2% for blue fluid pen inks, 95.6% for ball-point pen inks and 91.8% for blue ball-point pen inks, respectively. Obviously, the combined method has an excellent complementary effect and greatly raises the discriminating power. The nondestructive discriminating system offers an effective method to examine writing inks.
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