Problems of Forensic Sciences 2012 Vol. 92 (XCII) 253-264
CLASSIFICATION AND IDENTIFICATION OF BLACK BALLPOINT PEN INKS BASED ON MULTIVARIATE ANALYSIS AND INFRARED SPECTRA
Loong Chuen LEE1, 2, Mohamed Rozali OTHMAN1, Hiang PUA2, Ab Aziz ISHAK2, Seri Mirianti ISHAR2
1Faculty of Science & Technology, Universiti Kebangsaan Malaysia, Bangi, Malaysia
2Faculty of Health Science, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
Streszczenie
A non-destructive method for the classification and identification of black ballpoint pen inks on a questioned document was developed. Micro-ATR-FTIR spectroscopy allowed ink samples to be analysed in situ on a paper substrate. A total of 155 sample pens encompassing forty models of nine different brands were sampled from stationary shops at Subang Jaya, Malaysia. IR spectra data was processed by a number of multivariate analysis techniques, including cluster analysis (CA), principal component analysis (PCA) and discriminant analysis (DA). The proposed method gave satisfactory results relating to classification and identification of pen inks at the level of the brand as well as the model.
Słowa kluczowe
Infrared spectrum; Ink analysis; Classification; Identification; Principal component analysis; Discriminant analysis.