Microscopical examination is one of the least destructive means of determining rapid and accurate microscopic characteristics and generic polymer type of textile fibers. Additionally, a point-by-point, side-by-side microscopic comparison provides the most discriminating method of determining if two or more fibers are consistent with originating from the same source. This guideline requires specific pieces of instrumentation outlined herein.

1. Scope

1.1 This section describes guidelines for microscopical examinations employed in forensic fiber characterization, identification, and comparison. Several types of light microscopes are used, including, stereobinocular, polarized light, comparison, fluorescence, and interference. In certain instances, the scanning electron microscope may yield additional information. Select which test(s) or techniques to use based upon the nature and extent of the fiber evidence.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

AATCC Standards

Index Terms

fibers; forensic science; microscopic examination; Dispersion staining; Fibers; Forensic investigation/analysis; Manufactured fiber; Michel-L&cute;evy chart; Microscopic examination--textiles; Polarized light; Refractive index; Textile fiber (forensic) analysis; Birefringence;

ICS Code

ICS Number Code 37.020 (Optical equipment)

Citing ASTM Standards

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