Raman spectroscopy for forensic analysis of inks in questioned documents

Braz, André; Lopez‐López, María; García-Ruiz, Carmen

doi:10.1016/j.forsciint.2013.07.017

Cited by 138 publications

(58 citation statements)

References 38 publications

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“…Electronic absorption spectra of writing inks of the A-, B-and C-types. The comparison of Raman peaks of dyes as well as data on the thermal degradation of volatile components and dyes [16] show that the field of application of Raman spectroscopy can be expanded and that this technique can be used not only for analysis in forensic science (the identification of writing ink dyes and the determination of the sequence of the placing of inscriptions, drawings, and stamps on paper [1,2,13,17,18]), but also for the estimation of age of the material placed on the paper beyond the period of chromatography capabilities.…”

Section: Common Names (Ci Generic Name) Structural Formulamentioning

confidence: 99%

“…In turn, for convenience and better understanding, in the proposed methodology, we have to appeal to some previously reported results [16]. The methodological distinction of this from similar studies [1,2,13,17,18] was in considering the fact that the peak intensity in Raman spectrum also depends on the concentration of the studied compound within the focal spot of the laser beam, which was impossible to control in our case. Thus, in order to eliminate the influence of the concentration factor, we used the ratio of intensities instead of absolute intensity values.…”

Section: Introductionmentioning

confidence: 99%

“…However, the FTIR technique requires prior time-consuming sample preparation when used for the analysis of writing inks. Moreover, there are some difficulties related to the presence of strong absorption bands caused by paper overlapping with the absorption bands of an ink [13]. The most promising approach for investigation of dye degradation processes at this time is the Raman spectroscopy method.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Aging Processes of Writing Ink: Raman Spectroscopy versus Gas Chromatography Aspects

Grechukha¹,

Gorshkova

Panov

et al. 2017

Applied Sciences

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This work is devoted to the extremely popular but poorly developed scientific and forensic problem of the estimation of the actual dates of inscriptions placed on paper and made by ballpoint pens. It is shown that the degradation of writing inks with time may be controlled via Raman spectroscopy and gas chromatography. The time intervals for the implementation of each of these methods were determined using the ratios of the Raman peak intensities as degradation characteristics rather than their absolute values. In turn, this eliminates the effect of the concentration of a dye. The mutual influence of the volatile components and dyes of writing inks was also investigated and the time interval within which such influence is critical was found. According to the obtained results, a new methodological scheme for determining the age of documents, which were created at least 40 months ago, was proposed.

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Section: Common Names (Ci Generic Name) Structural Formulamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of the Aging Processes of Writing Ink: Raman Spectroscopy versus Gas Chromatography Aspects

Grechukha¹,

Gorshkova

Panov

et al. 2017

Applied Sciences

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“…However, such methods are invasive and time-consuming [6], and these disadvantages must be considered. Different approaches, such as Raman spectroscopy [7][8][9][10], UV-Vis spectroscopy [4,11], and IR spectroscopy [12], are based on the interaction of light with the substrate. Those methods ensure the physical integrity of the document, and yield data on organic and inorganic components of a sample.…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral imaging coupled with chemometric analysis for non-invasive differentiation of black pens

et al. 2016

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Differentiation of the written text can be performed with a non-invasive and non-contact tool that connects conventional imaging methods with spectroscopy. Hyperspectral imaging (HSI) is a relatively new and rapid analytical technique that can be applied in forensic science disciplines. It allows an image of the sample to be acquired, with full spectral information within every pixel. For this paper, HSI and three statistical methods (hierarchical cluster analysis, principal component analysis, and spectral angle mapper) were used to distinguish between traces of modern black gel pen inks. Non-invasiveness and high efficiency are among the unquestionable advantages of ink differentiation using HSI. It is also less time-consuming than traditional methods such as chromatography. In this study, a set of 45 modern gel pen ink marks deposited on a paper sheet were registered. The spectral characteristics embodied in every pixel were extracted from an image and analysed using statistical methods, externally and directly on the hypercube. As a result, different black gel inks deposited on paper can be distinguished and classified into several groups, in a non-invasive manner.

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“…3,4 A review unfolding the utility of Raman spectroscopy in the forensic analysis of different types of inks in questioned documents is available. 5 A review presenting a recent progress in characterizing trace amounts of body fluids using Raman spectroscopy is available. 6 A recent review describing the application of infrared and Raman spectroscopy to the identification of explosives is also available.…”

mentioning

confidence: 99%

Raman spectroscopy – Basic principle, instrumentation and selected applications for the characterization of drugs of abuse

Bumbrah

Sharma

2016

Egyptian Journal of Forensic Sciences

198

117

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This review gives an overview of the developments in the analysis of drugs of abuse and other illicit substances by Raman spectroscopy for forensic purpose. The review covers the brief overview of basic principle and instrumentation of Raman spectroscopy along with selected and recent applications for characterization of drugs of abuse using this technique. These applications show the potential value of Raman spectroscopy in the qualitative and quantitative analysis of trace amounts of drugs of abuse and other illicit substances on different matrices such as cloth, currency notes, fiber etc., without extensive sample preparation in a non-destructive manner. ª 2015 Hosting by Elsevier B.V. on behalf of The International Association of Law and Forensic Sciences (IALFS).

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Raman spectroscopy for forensic analysis of inks in questioned documents

Cited by 138 publications

References 38 publications

Analysis of the Aging Processes of Writing Ink: Raman Spectroscopy versus Gas Chromatography Aspects

Analysis of the Aging Processes of Writing Ink: Raman Spectroscopy versus Gas Chromatography Aspects

Hyperspectral imaging coupled with chemometric analysis for non-invasive differentiation of black pens

Raman spectroscopy – Basic principle, instrumentation and selected applications for the characterization of drugs of abuse

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