fiber analysis. problem what type of white fiber was left at the crime scene?
TRANSCRIPT
Fiber Analysis
Problem
What type of white fiber was left at the crime scene?
Research
Small, white fiber Folded 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 slowly Goes out Hair burning Black and brittle
Polyester Melts; shrinks away Melts; drips; burns
quickly Continues burning 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 Analysis Questions #1-6 & Conclusion
Leaf Analysis
Problem
What type of leaf was left at the crime scene?
Research
Dark green Left near the note 3 points on each leaf No leaves like it around
the school building
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 10A 3 points on a leaf