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Forensic Science HAIR AND FIBER ANALYSIS.

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Presentation on theme: "Forensic Science HAIR AND FIBER ANALYSIS."— Presentation transcript:

1 Forensic Science HAIR AND FIBER ANALYSIS

2 Forensic Science Natural fibers Plant & Animal

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

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

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

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

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

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

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

10 Hair Cross-section Forensic Science

11 Hair Cross-section Forensic Science

12 Light Colored Hair Forensic Science

13 Medulla Patterns Forensic Science

14 Your Analysis? Forensic Science

15 Pigment Patterns Forensic Science

16 Pigment Patterns Forensic Science

17 Cuticle Forensic Science Scale Patterns

18 Scale Patterns Forensic Science

19 Your Analysis? Forensic Science Hair Analysis

20 Your Analysis? Forensic Science

21 Your Analysis? Forensic Science

22 Hair Root Patterns Forensic Science

23 Hair Root Patterns Forensic Science

24 Forensic Science Synthetic fibers

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

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

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

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

29 Submission Protocol Forensic Science 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 Tape Tweezers Vacuum Undress Over Sheet Other? Collection Methods
Forensic Science Tape Tweezers Vacuum Undress Over Sheet Other? Follicular Tag Synthetics Mass Spec Tape Lift

31 Hair & Fibers Forensic Science The End

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