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Sejumlah 18 puncak telah ditentukan adalah berasal dari dakwat berdasarkan data kromtogram yang diekstrak pada tiga panjang gelombang yang berlainan (279, 370 and 400 nm). Manakala untuk analisis spektrometer UV-Nampak, kehadiran puncak pada panjang gelombang 303, 545, 577 and 584 nm telah direkodkan.

Some solvents, like oleic acid, do not easily evaporate, but oxidize with age (Cantu, A. As gel pens are now becoming popular, studies regarding the aging of their ink will likely emerge, and enter into the criminal justice system. Data spektra UV-Nampak adalah dihasilkan terutamanya dari komponen pewarna, i.e. yang dijumpai dalam dakwat dan UPLC besar kemungkinnya mengesan komponen dakwat selain daripada pewarna, i.e., bahan tambah. Sebagai kesimpulan, kuasa pembezalayan bagi UV-Nampak dan UPLC masing-masing telah ditentukan sebagai 72.12% and 98.48%. The study was carried out to quantify the amount of ink diffusion using luminosity as a parameter at different intervals of time by preparing a Common Reference Index Value (CRIV) and to assess whether particular writings were made at the same period of time. This study reveals that there are noticeable differences in the rates of diffusion of the same classes of inks, depending on time interval. Speckin Forensic Laboratories – The Forensic Specialist. The two more commonly studied ink aging properties are: 1) how well an ink extracts into a weak solvent, and 2) how much solvent remains in the ink. For fresh inks, both aging processes mentioned above (solvent evaporation and resin setting) contribute to each of these two properties. Discrimination analysis of 66 possible pen-pair of blue ballpoint pens was carried out via one-way ANOVA based on obtained chromatogram and spectra.A total of 18 peaks were determined as coming from inks based on the chromatographic data extracted at three different wavelengths (279, 370 and 400 nm).This new approach can determine the relative age of the ink, in a nondestructive manner, from any two writings created at different periods of time with the same class of ink. One of the challenges faced by the forensic document examiner is determining the age of a document/ink in order to ascertain whether entries or writings – such as those in logbooks, registers, OMR sheets, deeds, cheques, drafts, and other important documents – were executed in the same period or in different periods of time.