Lin, Seow Zhi (2025) Forensic characterisation of black stamp pad ink and printed inks. Other thesis, Universiti Sains Malaysia.
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Abstract
In today’s digital age, the advancements in printing technologies have significantly simplified various tasks in daily life. However, these advancements have also led to an unfortunate consequence, which is the increase in document fraud and forgery. Distinguishing authentic documents from counterfeit ones can be challenging, particularly when relying on visual inspection alone. This study aimed to investigate the forensic characteristics of black stamp pad ink and printed inks, employing a comprehensive approach that combines multiple analytical techniques. These included microscopy, thin layer chromatography (TLC), and Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) spectroscopy, alongside advanced multivariate statistical methods of Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA). A total of nine different samples were examined. The physical examination conducted in this study revealed significant morphological differences between hand-stamped impressions and printed ink samples. TLC analysis effectively separated the ink components using a chloroform-ethanol solvent system, with high Rf values indicating that the chemical compositions of certain ink types shared similar characteristics. ATR-FTIR spectroscopy, on the other hand, provided unique molecular fingerprints of the inks. However, challenges arose due to spectral overlap in the fingerprint region, making it difficult to fully distinguish between the ink types. Despite these challenges, PCA and HCA demonstrated their effectiveness in grouping the ink samples based on their chemical compositions, revealing distinctive clusters that allowed for the identification and differentiation of various ink types
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Forensic |
| Subjects: | R Medicine R Medicine > RA Public aspects of medicine > RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine |
| Divisions: | Kampus Kesihatan (Health Campus) > Pusat Pengajian Sains Kesihatan (School of Health Sciences) > Thesis |
| Depositing User: | MUHAMMAD AKIF AIMAN AB SHUKOR |
| Date Deposited: | 30 Oct 2025 00:11 |
| Last Modified: | 04 Nov 2025 03:02 |
| URI: | http://eprints.usm.my/id/eprint/63136 |
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