Colorimetric measurements on small paint fragments using microspectrophotometry

Laing, D.K.; Dudley, R.J.; Isaacs, M.D.J.

doi:10.1016/0379-0738(80)90169-3

Cited by 23 publications

(1 citation statement)

References 5 publications

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“…The comparison of the color of a control and suspect paint is normally the first step in any forensic paint examination. A microspectrophotometer was shown to offer a precise, rapid, and convenient method for defining the color of small paint fragments or a layer within a layer sequence (423). The microspectrophotometer provided high discrimination between sets of household paint of the same color (424).…”

Section: Forensic Biochemistrymentioning

confidence: 99%

Pharmaceuticals and related drugs

Gilpin¹,

Pachla²,

Ranweiler³

1983

Anal. Chem.

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Forensic Science in Applications Reviews. Given the tremendous diversity of materials received by forensic science facilities and the varied assortment of analytical techniques applied to their characterization, there has, and will remain, serious interest on the part of forensic scientists in the subject content of most reviews appearing within this Journal. It is the aim of this article to augment these reviews with a concise survey of articles appearing in publications that primarily appeal to forensic practitioners. To accomplish this objective, we have focused our attention on the following journals:

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Section: Forensic Biochemistrymentioning

confidence: 99%

Pharmaceuticals and related drugs

Gilpin¹,

Pachla²,

Ranweiler³

1983

Anal. Chem.

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Microspectrophotometry in Forensic Science

Ziȩba‐Palus¹

2000

Encyclopedia of Analytical Chemistry

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Infrared microspectrophotometry is a combination of two techniques – optical microscopy and infrared (IR) spectrometry – which supply specific information about the composition and structure of a given material. The equipment used is a Fourier transform infrared (FTIR) spectrometer connected on line with an optical microscope. The microscope allows observation of a sample in white light at relatively high magnification; this allows its morphology and microstructure to be established, and facilitates selection of the area which will subsequently be subjected to IR spectrometric analysis. The microscope also permits use of polarized light in investigations. The spectrometer enables analysis of a sample with a chosen measuring technique – transmission or reflection – with the aim of determining the chemical composition of the sample. It also supplies information about its microstructure and orientation. This method is particularly useful in the analysis of trace amounts of various substances secured as material evidence in court cases, and in analysis of the homogeneity of the sample, identification of inclusions and contaminants on the surface, and detection of structural defects. A specific advantage of this method is its ability to unambiguously photograph and record marked and measured areas of the sample and minimize the process of preparing the sample for analysis. Furthermore, IR microspectrophotometry gives the rare opportunity of studying small crystals or areas in the oriented materials by using polarized IR radiation, both by the transmission and the reflection technique. Its fundamental drawback is that the physical nature of the microsample may influence the precision of the photometric measurements and cause distortion of the spectra (artefacts) obtained. Furthermore, because only a small area is studied the heterogeneity of the sample and the amount of contaminants may significantly influence the results of spectrometric measurements. Microspectrophotometry in the ultraviolet/visible (UV/VIS) range is a combination of photometric measuring techniques and optical microscopy. It allows comparison of the color of very small samples of various materials, such as single fibers, tiny amounts of paint, traces of ink or ball‐point pen ink on a forged document in an objective way, independently of the sharpness and quality of the observers's vision. It yields immediate information about spectral differences existing between two samples of similar color, which are indistinguishable by use of the optical microscope. Additionally, using appropriate software to analyze the results of microspectrometric measurements, it enables precise measurement of a color, and – applying the theory of colors – gives a color a defined numerical value; this facilitates communication between experts working with this method. The equipment consists of an optical microscope with a spectrometer for analysis in the visible and ultraviolet range, connected to a microcomputer via an analog‐to‐digital converter.

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Microspectroscopy in Forensic Science

Reffner

2017

Encyclopedia of Analytical Chemistry

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Microspectroscopy is a family of technologies used for chemical analysis of evidence on a microscopic size scale. It is a combination of microscopy and analytical spectroscopy. Microscopy is the science of creating, recording, and interpreting magnified images. Analytical spectroscopy is the science of emission, absorption, reflection, or scattering of radian energy to determine structure, properties, or composition. Microspectroscopy technologies are grouped according to the type of incident energy used and the physical nature of its interaction with matter. Electron beams, X‐rays, ultraviolet, visible, and infrared (IR) radiations are all used in microspectroscopy. Because of its versatility, microspectroscopy is applied in various forms by forensic evidence examiners. The fundamental advantages of microspectroscopical techniques are the ability to detect items of interest, record images, analyze the composition of small amounts of sample, and document spectral data. In addition, microspectral analyses are generally possible without destroying the sample. These advantages make microspectroscopy a valuable tool for the forensic laboratories to detect and study trace evidence.

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Colorimetric measurements on small paint fragments using microspectrophotometry

Cited by 23 publications

References 5 publications

Pharmaceuticals and related drugs

Pharmaceuticals and related drugs

Microspectrophotometry in Forensic Science

Microspectroscopy in Forensic Science

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