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