Forensics - chemical treatment

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  • Created by: Ashlee
  • Created on: 01-05-15 16:21
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  • chemical treatment unit
    • iso standards
      • iso17025 accredited
      • quality management system
      • nationally recognised
      • recognition of competence
      • transparent system of work to the same standards following policies and procedures
    • looking for..
      • fats/lipids
      • water
      • amino acids
      • salt
      • other contaminants - drugs, food, paint
      • constituents of sweat
    • exhibit types
      • porous
        • newspapers, boxes, money, letters, clothes
      • non-porous
        • guns, weapons, credit cards, plastic bags
    • type of treatments
      • destructive
      • non-destructive
    • light sources
      • crime lite
      • schott light
      • quaser
      • laser
      • coloured light optimises ridge detail
      • flourescence
        • materials absorb light on certain wavelengths/colour and re-emit that light at lower intensity
        • filter required to cut out original light
    • treatments
      • ninhydrin
        • high-contrast purple that’s readily visible when applied
      • DFO
        • makes fingerprints glow when they are lit by blue-green light
      • ethyl cyanoacrylate/superglue
        • reacts with the traces of amino acids, fatty acids, and proteins  to produce a visible, sticky white material that forms along the ridges of the fingerprint
      • fluorescent dyes
      • superfume
      • powder suspension
        • aluminium powder
        • black or jet blackmagnetic powder
        • black granular powder
      • protein stains
        • coomassie blue
        • Crowle’s double stain
      • vacuum metal deposition/ VMD
        • tiny amounts of gold and zinc metallic thin film coatings are evaporated onto flexible non-porous substrates
      • physical developer/ VD
      • document analysis

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