Paint

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  • Created by: Ashlee
  • Created on: 03-05-15 20:58
What are 3 types of paint?
Water based, automobile and oil based
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What is the solvent for water based paints?
Water
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How do water based paints work?
Binder polymerises and hardens as dries, forms film and holds to surface
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What is the solvent for oil based paints?
Mix of hydrocarbons
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How do oil based paints work?
Solvent evaporates and dries
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How would you collect paint at the scene?
Control sample; small flakes 1cm2 onto paper; whole item; large flecks with tweezers
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What are the 4 components of automobile paint?
Electro coat primer; primer surface; basecoat and clearcoat
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What is an electrocoat primer for?
Corrosion resistence
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What is a primer surface for?
Smoothness
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What is a basecoat for?
Enriched colour
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What is a clearcoat for?
Protection
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What is the forensic value of paint?
Make/colour/year of car; links object to victim; links object to crime scene; physical matches; layer analysis
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What is the primary pigment of blue & green?
Organic compounds
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What is the primary pigment of white?
Titanium dioxide
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What is the primary pigment of black?
Carbon
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What is the primary pigment of green?
Chromium oxide
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What is the primary pigment of orange?
Cadmium sulfide
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What is the primary pigment of brown/red?
Iron oxide
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What is a pigment?
Finely ground insoluble particle
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Why is a pigment used?
Colour, durability and hardness
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What is a binder?
Non-volatile liquid which binds pigment particles together
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How would you analyse paint?
Microscope; chemical reactions; fluorescence microscopy; infrared microspectrophotometry; scanning electron microscopy with x-ray microanalysis
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What characteristics would you look for when analysing paint?
Size; shape; colour; thickness; surface condition; layer sequence
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Other cards in this set

Card 2

Front

What is the solvent for water based paints?

Back

Water

Card 3

Front

How do water based paints work?

Back

Preview of the front of card 3

Card 4

Front

What is the solvent for oil based paints?

Back

Preview of the front of card 4

Card 5

Front

How do oil based paints work?

Back

Preview of the front of card 5
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