http://unisep.lib.unishams.edu.my/xmlui/handle/123456789/6441 2026-04-22T22:13:07Z 2026-04-22T22:13:07Z Farhana MG, Dr. Dzulkiflee I, Dr. http://unisep.lib.unishams.edu.my/xmlui/handle/123456789/11889 2020-02-10T14:22:32Z 2018-06-01T00:00:00Z

Forensic Discrimination of Lipstick Smears Using Attenuated Total Reflectance–Fourier Transform Infrared (Atr-Ftir) Spectroscopy With Chemometrics Techniques Farhana MG, Dr.; Dzulkiflee I, Dr. Lipstick smear is one of the trace evidence that may transfer due to contact between suspect, victim and crime scene. The main objective of this study was to discriminate and classify 12 red lipstick samples of local and international brands using ATR-FTIR spectroscopy coupled with chemometrics techniques of principle component analysis and hierarchical cluster analysis. The result obtained from hierarchical cluster analysis is in conformance with principle component analysis. The application of chemometrics techniques had successfully separated and discriminated the red lipstick samples into six distinctive clusters according to their brands.

2018-06-01T00:00:00Z Hafizah MS, Dr. Dzulkiflee I, Dr. http://unisep.lib.unishams.edu.my/xmlui/handle/123456789/11887 2020-02-10T14:23:30Z 2018-06-01T00:00:00Z

Study on The Effect of Ageing to Pen Ink On Papers Using Attenuated Reflectant Mode Fourier Transform Infrared (Atr-Ftir) Spectroscopyinfarction Hafizah MS, Dr.; Dzulkiflee I, Dr. Forensic analysis of writing ink ageing on document is one of the most challenging parts in forensic investigation. It can significantly prove to be useful in forensic document examination as it helps to build a timeline of an event or provide link to investigation. The objective of this study was to study the effect of ageing to gel pen ink on different papers i.e. A4, envelop, newspaper and manila card using Attenuated Reflectant Mode Fourier Transform Infrared (ATR-FTIR) spectroscopy. Inks were deposited on four different types of papers and subsequently subjected to ageing at different interval (7, 14, 30, 60 and 90 days). The aged and fresh inks were compared through visual examination and statistical evaluation using paired t-test was then carried out based on their mean absorbance. The results showed that the gel pen ink deposited on different types of papers subjected to ageing could not be differentiated from their fresh counterpart using ATR-FTIR and statistical analysis. As a conclusion, under the experimental parameters used in this study, the writing inks deposited on different types of papers subjected to ageing could not be differentiated from their fresh counterpart using ATR-FTIR andstatistical analysis.

2018-06-01T00:00:00Z