sažetak izlaganja sa skupa
Given the importance of forensic ink analysis, especially in the identification and dating of documents, research focused on the degradation of Crystal Violet under different conditions may reveal valuable insights. Crystal Violet (CV) is a synthetic colorant used in the pen ink industry, and analysis of its degradation can provide useful information about ink durability and document authenticity. Room conditions simulate typical conditions of exposure of samples to sunlight through window glass and the conditions in which documents are expected to be stored. The samples were exhibited in May 2024 at middle European latitudes (Zagreb, Croatia). In addition to the real conditions, the samples were also subjected to conditions of accelerated aging according to a standard ISO 12040 (Graphic technology, Prints and printing inks, Assessment of light fastness using filtered xenon arc light), which includes exposing the samples to conditions of 50 °C, 35% relative humidity, and 42 W/m2 irradiation intensity. ISO 12040 uses a filtered xenon arc to simulate sunlight and assess color fastness. Samples are exposed to defined light cycles to evaluate color stability over time. The mentioned conditions lead to accelerated degradation of the ink, i.e. affect the chemical stability of the ink. With this method, it is possible to simulate real conditions in the environment and predict how well the ink will retain its characteristics and quality over time, which is important for the reliable evaluation of forensic results. By measuring and analyzing the quantitative indicator of Crystal Violet in the blue inks of ballpoint pens, using the High-performance liquid chromatography (HPLC) method depending on the passage of time from zero to 10 days and different conditions of exposure of the samples, it was confirmed that in the samples subjected to the process of natural and accelerated aging there is reduction of the quantitative indicator of Crystal Violet. By comparing the measurement results with two sample exposure methods, it can be concluded that the sample exposure methods do not give the same results. It should be emphasized that the samples were not exposed to different types of room light sources that would have an additional effect on the samples or on the ink (eg fluorescent lamps, LED lights). This research not only provides insights into chemical degradation processes but also encourages the development of strategies for the preservation and protection of forensic evidence in practice.
crystal violet, degradation, room conditions, accelerated aging conditions
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