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                            Library & Multimedia
 Microscopical recognition and characterization of solution dyed fibers
NCJ Number
              308287
Journal

*Journal of Forensic Sciences* Issue: 69 Dated: 2024 Pages: 1
Author(s)
          Kelly Brinsko-Beckert;
                        Skip Palenik;
                        Otyllia R. Abraham;
                        Ethan Groves;
                        Christopher S. Palenik
Date Published

2024
Length
              21 pages
Annotation
              This paper discusses microscopical recognition and characterization of solution dyed fibers.
Abstract
              This paper presents the development of a microscopical process to first recognize a fiber as solution dyed and subsequently characterize the color and optical properties of each type of pigment found in a given fiber. To this end, a set of 76 fibers, representing polypropylene, nylon, polyester, and rayon, spanning all nominal colors and several consumer applications were analyzed longitudinally and in cross section using a combination of polarized light, fluorescence, and oil immersion microscopy. A given fiber contained between one and six different pigments, and a total of 260 pigments (not all unique) were recognized within this set of fibers. Pigment morphologies were categorized as angular, elongated, rounded, finely divided, or streaky, and about 40% of the pigments fluoresced. Ultimately, this body of data is intended to provide trace evidence examiners with a specific approach to recognize and begin to exploit pigmented fibers encountered in casework. Solution dyed fibers are synthetic fibers colored through the addition of insoluble pigmentation to the polymer prior to extrusion. This is in contrast to most textile fibers, which are traditionally colored via immersion in liquid dyebaths following extrusion. Solution dyed fibers are increasing in market share in numerous applications (e.g., apparel, carpet, upholstery), and thus, the microscopic characteristics and variety of pigments used to color them represent unexploited properties in forensic fiber comparisons. (Published Abstract Provided)
      
  
          Additional Details
Grant Number(s)
        15PNIJ-21-GG-04185-RESS


  
  
        
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        NIJ-Sponsored


  
  
        
  Publication Type
        Research (Applied/Empirical)


  
  
        
  Award
        Applied Research in the Characterization, Identification, and Comparison of Pigmented Fiber Evidence
    
  
  
Date Published: January 1, 2024
    
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