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NCJRS Abstract

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NCJ Number: 218830 Add to Shopping cart Find in a Library
Title: Forensic Fiber Examinations Guidelines
Journal: Forensic Science Communications  Volume:1  Issue:1  Dated:April 1999  Pages:1-91
Corporate Author: Scientific Working Group for Materials Analysis (SWGMAT)
United States of America
Date Published: April 1999
Page Count: 91
Sponsoring Agency: Scientific Working Group for Materials Analysis (SWGMAT)
Quantico, VA 22135
Document: HTML|PDF
Type: Guideline
Format: Document (Online)
Language: English
Country: United States of America
Annotation: Intended for use by forensic fiber examiners, this document presents guidelines for performing various fiber analysis methods.
Abstract: The introductory chapter notes that the various analytical methods available for fiber analysis yield different kinds of information. The examiner should select a combination of methods and apply them in an order that provides the most exclusionary information first. This introductory chapter also discusses sample handling, analysis of fiber samples, and report documentation. The second chapter contains guidelines for microscopical examination used in forensic fiber characterization, identification, and comparison. Guidelines for the visible spectroscopy of textile fibers are contained in chapter 3. Visible spectroscopy can be used as a quantitative and objective method of color analysis and comparison as an integral part of any fiber color comparison. Chapter 4 presents guidelines for performing thin-layer chromatography (TLC) of nonreactive dyes in textile fibers. These guidelines are concerned with the extraction of dyes from single fibers and from bulk material, classification of the dye or colorant, the application and development of the extractants on TLC plates using an optimal elution system, and evaluation and interpretation of the resulting chromatograms. Guidelines for conducting pyrolysis gas chromatography (PGC) of textile fibers are provided in chapter 5. These guidelines are intended to assist individuals and laboratories that conduct PGC in their selection, application, and evaluation of PGC as a method for forensic fiber case work. The guidelines are concerned with the pyrolysis of single fibers and fibers from bulk material, classification of the generic class of polymer, and interpretation of the resulting pyrograms. Chapter 6 contains guidelines for the infrared analysis of textile fibers. These guidelines cover the identification of fiber polymer composition by interpretation of absorption spectra obtained by microscopical infrared spectroscopy. Guidelines in chapter 7 pertain to fabric and cordage. Chapter references, tables, and figures
Main Term(s): Criminology
Index Term(s): Chromatography; Electron microscopy; Forensic science training; Forensic sciences; Hair and fiber analysis; Investigative techniques; Spectroscopy
Note: Downloaded June 12, 2007.
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