1. Fibres and Fabrics Fibres can be an important trace element at a crime scene. They may have come from a large number of sources including: The criminals clothes Carpet or curtains at the crime scene A rug or blanket used to move a body

2. Fibres and Fabrics Fibres can either be synthetic (man made) or natural (from plants or animals) Synthetic FibresNatural Fibres from Plants Nylon Polyester Carbon fibre Rayon Cotton Linen Hemp Flax Wool Silk Mohair

3. Fibres and Fabrics Different fibres have different properties such as strength and thickness. These properties can be used to compare fibres from a crime scene to those found on a criminal.

4. Webquest Questions 1.Explain how fibres can be important evidence in the solving of a crime? 2.Try to find the name of 6 different fibres (two synthetic, two from animals, and two from plants and compare their properties in a table similar to below? 3.Using the information in your table, what test forensic would you perform for comparing fibres? Fabric NameStrengthThickness of strand Flammability or Melting point Common uses Example: CottonStrong fabric250 degrees CClothing, medical supplies

5. Homework Write a short description of a criminal case in which fibres were used as important forensic evidence?

6. Fibre Burn Test http://youtu.be/4rvC7E4iaUY http://www.youtube.com/watch?v=1M_Kr1Y9etY