Forensics - fibres

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  • Created by: Ashlee
  • Created on: 28-04-15 16:55
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  • Textile fibres
    • principles
      • locards exchange
        • direct and indirect transfer
        • A --> B or A --> B --> C
        • primary/secondary transfer
      • avoid contamination
      • retention of transferred fibres
      • shed well = retain well
      • persistence = TWAT
        • time
        • washing
        • activity
        • textile
    • classification
      • natural
        • animal/vegetable/mineral
        • cotton/wool/silk
      • manmade
        • natural and synthetic materials not in group
        • carbon/ textile glass/ metal/ cellulose/ viscose/ modal/ acetate
      • synthetic polymer fibres
        • 2 materials mixed
    • analysis
      • microscope
        • size
        • colour
        • shape/cross section
        • fibre type
        • lustre
    • identification
      • round = nylon/polyester
      • bean = acrylic
      • dogbone = acrylic
      • multilobal = viscose
      • triangular = silk
      • trilobal = nylon
      • lobular = acetate
    • collection
      • tapings/handpicking
      • only interested in extraneous fibres
      • cover whole surface area
      • not fibres from original item that fibres are collected from
      • light source - UV, laser, high intensity
      • scraping
      • vacuuming
    • further analysis/comparison
      • tape search against control
      • birefringence
      • dye classification
      • microspectophotometry
      • thin layer chromotography
      • fourier transform infrared spectroscopy
    • interpretation/probative value
      • matching fibres?
      • number of fibres significant?
      • common?
      • unique?
      • likelihood of finding fibre by chance?

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