Fiber Analysis

1
Fiber Analysis
2
Problem

• What type of white fiber was left at the crime
  scene?

3
Research

• Small, white fiber
• Stringy and curly
• Fiber looks like cotton or nylon
• Athletic clothing is made from nylon or cotton

4
Hypothesis

• If the fiber left at the crime scene has the same
  characteristics as the known substance
  _____________ then it is ___________ .

5
Nylon

• Shrinks away
• Drips melts
• Continues to burn
• Chemical
• Hard bead

6
Cotton

• Burns on contact
• Burns rapidly
• Glows or continues to burn
• Paper/wood burning
• Burns fully gray ash

7
Silk

• Curls singes
• Burns rapidly
• Goes out
• Hair burning
• Black and brittle

8
Polyester

• Melts shrinks away
• Melts drips burns quickly
• Goes out and hardens
• Chemical or plastic
• Hard bead

9
Evidence

• Burns on contact
• Burns rapidly
• Glows or continues to burn
• Paper/wood burning
• Burns fully gray ash

10
Homework

• Fiber Analysis Packet Answer Analysis Questions
  1-6 Conclusion

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Leaf Analysis
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Problem

• What type of leaf was left at the crime scene?

13
Research

• Dark green
• Left near the note
• 5 points on each leaf
• Possible tree types

14
Hypothesis

• If the leaves are identified then they will be
  consistent with ________________ leaves.

15
Observations

• 1B Not round
• 2B Not spade shaped
• 3B Not covered with hair
• 4B Smooth edge
• 5A Dark green
• 6B Not striped
• 7B Not scalloped edge
• 8B Does not have spots
• 10B 5 points on a leaf (5 point ivy tree)

16
Homework

• Leaf Analysis Packet
• Answer Analysis Questions 1- 6 Conclusion