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Forensic Science HAIR AND FIBER ANALYSIS. Forensic Science Natural fibers Plant & Animal.

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Presentation on theme: "Forensic Science HAIR AND FIBER ANALYSIS. Forensic Science Natural fibers Plant & Animal."— Presentation transcript:

1 Forensic Science HAIR AND FIBER ANALYSIS

2 Forensic Science Natural fibers Plant & Animal

3 Forensic Science Natural Fibers Plant: Linen (flax) & cotton Animal: Silk, hair, fur & wool

4 Forensic Science Natural Fibers Cellulose Based Fibers Manufactured, but from natural fiber materials. - Rayon (1910) - Acetate (1924)

5 Forensic Science Natural Fibers Whole Fabric Traits - Color - Texture - Weight

6 Forensic Science Natural Fibers Fiber Analysis - Tests Absorbancy Test: - does it absorb water or repel it?

7 Forensic Science Natural Fibers Fiber Analysis - Tests Burn Test: - moves away from flame. - smells like singed hair. - burns to ash.

8 Forensic Science Natural Fibers Fiber Analysis - Tests Elasticity Test: - how much can it be stretched?

9 Forensic Science Hair, Fur & Wool Skin cross- section

10 Forensic Science Hair Cross-section

11 Forensic Science Hair Cross-section

12 Forensic Science Light Colored Hair

13 Forensic Science Medulla Patterns

14 Forensic Science Your Analysis?

15 Forensic Science Pigment Patterns

16 Forensic Science Pigment Patterns

17 Forensic Science Cuticle Scale Patterns

18 Forensic Science Scale Patterns

19 Forensic Science Your Analysis? Hair Analysis

20 Forensic Science Your Analysis?

21 Forensic Science Your Analysis?

22 Forensic Science Hair Root Patterns

23 Forensic Science Hair Root Patterns

24 Forensic Science Synthetic fibers

25 Forensic Science Synthetic Fibers Man-made from petroleum products or other chemicals. No medulla or scale patterns.

26 Forensic Science Synthetic Fibers Polyester (Dacron & Duroflex) Nylon (Polyamide) Acrylic Moire Polypropylene (Olefin)

27 Forensic Science Synthetic Fibers Fiber Analysis Burn Test: - Will tend to melt. - Solidify when cooled. - Give off unpleasant odor. - Give off toxic vapor.

28 Forensic Science Submission Protocol FABRIC: When possible, submit the entire garment or textile. Submit fibers in clean paper or an envelope with sealed corners.

29 Forensic Science Submission 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.

30 Forensic Science Collection Methods 1) Tape 2) Tweezers 3) Vacuum 4) Undress Over Sheet 5) Other? SyntheticsFollicular TagTape LiftMass Spec

31 Forensic Science Hair & Fibers The End


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