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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
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ForensicScience HAIR AND FIBER ANALYSIS
ForensicScience Natural fibers Plant & Animal
Natural Fibers ForensicScience Plant: Linen (flax) & cotton Animal: Silk, hair, fur & wool
Natural Fibers ForensicScience Cellulose Based Fibers Manufactured, but from natural fiber materials. - Rayon (1910) - Acetate (1924)
Natural Fibers ForensicScience Whole Fabric Traits - Color - Texture - Weight
Natural Fibers ForensicScience • Fiber Analysis - Tests • Absorbancy Test: • does it absorb water or • repel it?
Natural Fibers ForensicScience • FiberAnalysis - Tests • Burn Test: • moves away from flame. • smells like singed hair. • burns to ash.
Natural Fibers ForensicScience • FiberAnalysis - Tests • Elasticity Test: • how much can it be • stretched?
Hair, Fur & Wool ForensicScience Skin cross- section
Hair Cross-section ForensicScience
Hair Cross-section ForensicScience
Light Colored Hair ForensicScience
Medulla Patterns ForensicScience
Your Analysis? ForensicScience
Pigment Patterns ForensicScience
Pigment Patterns ForensicScience
Cuticle ForensicScience Scale Patterns
Scale Patterns ForensicScience
Your Analysis? ForensicScience Hair Analysis
Your Analysis? ForensicScience
Your Analysis? ForensicScience
Hair Root Patterns ForensicScience
Hair Root Patterns ForensicScience
ForensicScience Synthetic fibers
Synthetic Fibers ForensicScience Man-made from petroleum products or other chemicals. No medulla or scale patterns.
Synthetic Fibers ForensicScience Polyester (Dacron & Duroflex) Nylon (Polyamide) Acrylic Moire Polypropylene (Olefin)
Synthetic Fibers ForensicScience Fiber Analysis Burn Test: - Will tend to melt. - Solidify when cooled. - Give off unpleasant odor. - Give off toxic vapor.
Submission Protocol ForensicScience FABRIC: When possible, submit the entire garment or textile. Submit fibers in clean paper or an envelope with sealed corners.
Submission Protocol ForensicScience 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.
Collection Methods ForensicScience • Tape • Tweezers • Vacuum • Undress Over Sheet • Other? Follicular Tag Synthetics Mass Spec Tape Lift
Hair & Fibers ForensicScience The End