The discrimination potential of ultraviolet-visible spectrophotometry, thin layer chromatography, and Fourier transform infrared spectroscopy for the forensic analysis of black and blue ballpoint inks |
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Authors: | Causin Valerio Casamassima Rosario Marega Carla Maida Pietro Schiavone Sergio Marigo Antonio Villari Antonino |
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Affiliation: | Dipartimento di Scienze Chimiche dell'Università, via Marzolo 1, 35131 Padova, Italy. valerio.causin@unipd.it |
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Abstract: | The knowledge of the discriminating power of analytical techniques used for the differentiation of writing inks can be useful when interpreting results. Ultraviolet-visible (UV-VIS) spectrophotometry, thin layer chromatography (TLC), and diffuse reflectance Fourier transform infrared spectroscopy (FT-IR) were used to examine a population of 21 black and 12 blue ballpoint writing inks. Based on corroborative results of these methods, the discrimination power for UV-VIS, TLC, and FT-IR was determined to be 100% and 98% for the black and blue inks, respectively. Generally, TLC and UV-VIS can be used to differentiate the colorant components (i.e., dyes and some pigments) found in inks. As FT-IR can be utilized to identify some of the noncolorant components, it was determined to be an excellent complementary technique that can be implemented into an analytical scheme for ink analysis. |
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Keywords: | forensic science questioned documents inks ultraviolet‐visible spectroscopy thin layer chromatography Fourier transform infrared spectroscopy |
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