Forensics - paint

HideShow resource information
  • Created by: Ashlee
  • Created on: 28-04-15 14:41
View mindmap
  • Paint
    • Road traffic collision; burglary
    • pigment; solvent & binder
      • pigment = finely ground, insoluble particle
        • colour
        • durability
        • hardness
      • binder = non-volatile liquid which binds pigment particles together
    • organic & inorganic
    • water & oil based
    • primary pigments
      • white = titanium dioxide
      • black = carbon
      • brown/red = iron oxide
      • orange = cadmium sulfide
      • green = chromium oxide
      • blue & green = organic compounds
    • oil based paints
      • spread paints and solvent evaporates
      • solvent = mix of hydrocarbons
    • water based paints
      • solvent = water
      • binder polymerises and hardens as dries
      • forms film and holds to surface
    • automobile paint
      • complex
      • 1) electrocoat primer for corrosion resistence
        • 2) primer surface for smoothness
          • 3) basecoat for enriched colour
            • 4) clear coat for protection
    • collection
      • nature of interaction/ease of exchange
      • seize whole item where possible
      • large flecks with tweezers
      • take control sample
      • small flakes 1cm squared scraped onto paper
    • analysis
      • microscope
        • size & shape
        • surface condition
        • colour
        • layer sequence
        • thickness
        • probative value
        • non-destructive
      • further analysis
        • chemical reactions
        • fluorescence microscopy
        • infrared microspectrophotometry
        • scanning electron microscopy with x-ray microanalysis
        • destructive
    • forensic value
      • links object to crime scene
      • links object to victim
      • physical matches - evidence of original source
      • analysis = make/model/year of automobile
      • analysis = layers provide strong evidence of original source

Comments

No comments have yet been made

Similar Criminology resources:

See all Criminology resources »See all Forensic Studies resources »