Using Raman Spectroscopy to solve crime: inks, questioned documents and fraud

Claybourn, M.; Ansell, M. F.

doi:10.1016/s1355-0306(00)71996-4

Cited by 90 publications

(59 citation statements)

References 26 publications

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“…A parte superior do algarismo "4", ou seja, a parte falsificada apresenta uma resposta Raman com domínio fluorescente, enquanto que a parte inferior, parte autêntica, mostra um espectro Raman com baixo deslocamento da linha base devido à fluorescência. 5 Diferentemente do FTIR, a técnica Raman consegue distinguir vários tipos de tintas com composição química bem similar como, por exemplo, as canetas esferográficas de coloração preta. Análises de cruzamento de traços podem também ser realizadas, independemente da composição e interação química existente entre a tinta e o substrato evitando, assim, a ocorrência de resultados falso-positivos.…”

Section: Espectroscopia Ramanunclassified

“…6 A técnica Raman vem se mostrando bastante promissora para a análise de tintas envolvendo falsificação de documentos; entretanto, poucos trabalhos são descritos na literatura. 5,6 Para problemas envolvendo datação de tintas, por exemplo, nenhuma publicação foi encontrada utilizando esta técnica.…”

Section: Espectroscopia Ramanunclassified

“…Embora a química forense seja um tema muito importante e que desperte cada vez mais interesse perante a sociedade científica, a sua aplicação no campo da criminalística ainda constitui uma nova linha de pesquisa no Brasil. A Figura 1 mostra a distribuição dos recentes métodos analíticos que estão sendo aplicados em documentoscopia, balística forense e drogas de abuso, nos períodos de (1a) 1990-2000 e (1b-c) 2001-2010. Na documentoscopia, até 2000, as técnicas de espectroscopia molecular (infravermelho, [1][2][3][4] Raman, 5,6 fluorescência molecular 7 ) e de separação (cromatografia [8][9][10] e eletroforese [11][12][13][14][15] ) foram as mais empregadas, apresentando juntas, 219 citações (Figura 1a). A partir de 2001, com o surgimento de novas técnicas em espectrometria de massas (MS -mass spectrometry), problemas complexos que existiam até o momento tornaram-se solucionáveis.…”

Section: Introductionunclassified

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Química forense: perspectivas sobre novos métodos analíticos aplicados à documentoscopia, balística e drogas de abuso

Romão¹,

Schwab²,

Bueno³

et al. 2011

Quím. Nova

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Section: Espectroscopia Ramanunclassified

Section: Introductionunclassified

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Química forense: perspectivas sobre novos métodos analíticos aplicados à documentoscopia, balística e drogas de abuso

Romão¹,

Schwab²,

Bueno³

et al. 2011

Quím. Nova

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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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“…Furthermore, the development of increasingly close links between forensic laboratories has necessitated, on the one hand, establishment of common standards of research, and on the other, the widespread introduction of quality ensuring procedures in order to obtain full repeatability and reliability in conducted research. The present work concerns research into the possibility of differentiating between blue ballpoint pen inks by means of five techniques which do not require the destruction of the document, based on the following: measurement of the level of absorption and luminescence of ballpoint pen inks in visible, Infrared light and Raman absorption spectrometry [2][3][4]; and one technique which destroys the document -thin layer chromatography [5]. The discriminative powers of the particular methods were compared in the course of analyzing blue ballpoint pen inks produced by four popular firms that guarantee good quality and uniformity of their products.…”

Section: Introductionmentioning

confidence: 99%

Forensic Discrimination Potential of Video Spectral Comparator and Micro Spectrophotometer in Analyzing Question Document and Fraud Cases in India

SR¹,

SV²

2016

J Forensic Res

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The aim of the study was to evaluate the discriminating power of non-destructive methods, including optical methods likes the Video spectral comparator method (VSC) and Micro spectrophotometer (MSP) used to differentiate ballpoint pen ink which is commonly used in question document and fraud cases in India. Documents have been investigated to determine the feasibility of utilizing the Video spectral comparator method (VSC) and Micro spectrophotometer (MSP) for the differentiation and comparison of inks on paper. The work focused on how to develop the most effective procedure to ensure quality, when Micro spectrophotometer is used to differentiate writing materials by characteristics color scan of each ink. Six different commercially available blue ballpoint pen inks produced from most popular pens in Indian Market which were used as research material. We have studied most selling pens in Indian market (Reynolds, Parker, and Lexis 2 types, Cello griper and local made pen) for overwriting, alternation and modification of ballpoint pen ink on documents. These pens are generally used on questioned document in forensic discrimination cases and these questioned documents cases received by forensic science laboratories regularly. In forensic discrimination cases generally initial writing is overwritten by using other ink and to identify which ink was used to overwrite is challenging task in field of forensic science. The present study highlighted that the Video Spectral Comparator method (VSC) and Micro spectrophotometer (MSP) can be used routinely in such types of document cases and it has demonstrated to be an excellent analytical method for the forensic analysis of inks on a questioned document.

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Using Raman Spectroscopy to solve crime: inks, questioned documents and fraud

Cited by 90 publications

References 26 publications

Química forense: perspectivas sobre novos métodos analíticos aplicados à documentoscopia, balística e drogas de abuso

Química forense: perspectivas sobre novos métodos analíticos aplicados à documentoscopia, balística e drogas de abuso

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

Forensic Discrimination Potential of Video Spectral Comparator and Micro Spectrophotometer in Analyzing Question Document and Fraud Cases in India

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