forensic science
Post on 08-Jan-2016
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ForensicScience
HAIRANDFIBERANALYSIS
ForensicScience
NaturalfibersPlant & Animal
ForensicScienceNatural Fibers
Plant:Linen (flax) & cotton
Animal:Silk, hair, fur & wool
ForensicScienceNatural Fibers
Cellulose Based FibersManufactured, but from natural fiber materials.
- Rayon (1910)- Acetate (1924)
ForensicScienceNatural Fibers
Whole Fabric Traits
- Color- Texture- Weight
ForensicScienceNatural Fibers
Fiber Analysis - Tests
Absorbancy Test: - does it absorb water or repel it?
ForensicScienceNatural Fibers
Fiber Analysis - Tests
Burn Test: - moves away from flame.- smells like singed hair. - burns to ash.
ForensicScienceNatural Fibers
Fiber Analysis - Tests
Elasticity Test: - how much can it be stretched?
ForensicScienceHair, Fur & Wool
Skincross-section
ForensicScienceHair Cross-section
ForensicScienceHair Cross-section
ForensicScienceLight Colored Hair
ForensicScienceMedulla Patterns
ForensicScienceYour Analysis?
ForensicSciencePigment Patterns
ForensicSciencePigment Patterns
ForensicScienceCuticle
ScalePatterns
ForensicScienceScale Patterns
ForensicScienceYour Analysis? Hair Analysis
ForensicScienceYour Analysis?
ForensicScienceYour Analysis?
ForensicScienceHair Root Patterns
ForensicScienceHair Root Patterns
ForensicScience
Syntheticfibers
ForensicScienceSynthetic Fibers
Man-made from petroleum products or other chemicals.
No medulla or scale patterns.
ForensicScienceSynthetic Fibers
Polyester (Dacron & Duroflex)
Nylon (Polyamide)
AcrylicMoirePolypropylene (Olefin)
ForensicScienceSynthetic Fibers
Fiber Analysis
Burn Test: - Will tend to melt. - Solidify when cooled. - Give off unpleasant odor. - Give off toxic vapor.
ForensicScienceSubmission Protocol
FABRIC:When possible, submit the entire garment or textile. Submit fibers in clean paper or an envelope with sealed corners.
ForensicScienceSubmission Protocol
HAIRS: Collect at least 25 known hairs from different parts of the head and/or pubic region. Comb and pull out the hairs. Submit hairs in clean paper or envelope with sealed corners.
ForensicScienceCollection Methods
1) Tape2) Tweezers3) Vacuum4) Undress Over Sheet5) Other?
SyntheticsFollicular Tag Tape LiftMass Spec
ForensicScienceHair & Fibers
TheEnd
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