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Fiber Analysis. Problem. What type of white fiber was left at the crime scene?. Research. Small, white fiber Stringy and curly Fiber looks like cotton or nylon Athletic clothing is made from nylon or cotton. Hypothesis.
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Problem • What type of white fiber was left at the crime scene?
Research • Small, white fiber • Stringy and curly • Fiber looks like cotton or nylon • Athletic clothing is made from nylon or cotton
Hypothesis • If the fiber left at the crime scene has the same characteristics as the known substance _____________ then it is ___________ .
Nylon • Shrinks away • Drips; melts • Continues to burn • Chemical • Hard bead
Cotton • Burns on contact • Burns rapidly • Glows or continues to burn • Paper/wood burning • Burns fully; gray ash
Silk • Curls; singes • Burns rapidly • Goes out • Hair burning • Black and brittle
Polyester • Melts; shrinks away • Melts; drips; burns quickly • Goes out and hardens • Chemical or plastic • Hard bead
Evidence • Burns on contact • Burns rapidly • Glows or continues to burn • Paper/wood burning • Burns fully; gray ash
Homework • Fiber Analysis Packet: Answer AnalysisQuestions #1-6 & Conclusion
Problem • What type of leaf was left at the crime scene?
Research • Dark green • Left near the note • 5 points on each leaf • Possible tree types:
Hypothesis • If the leaves are identified then they will be consistent with ________________ leaves.
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)
Homework • Leaf Analysis Packet: Answer Analysis Questions #1- 6 & Conclusion