Name ______________________________________________ Forensics Review: Fiber Analysis 2015 FIBERS: Natural Cotton Synthetic Polyester Linen Silk Wool Rayon Acetate Nylon For each of the above, you should be able to: A. B. C. D. E. Identify how they react to fire (burn test). Identify how they react to acetone, HCl, and bleach. (except linen and polyester) Identify physical properties with and without a microscope. Identify the source of the natural fibers (plant v animal). Identify their color in a stain test. (except linen and polyester) Key Ideas: 1. 2. 3. 4. 5. 6. 7. 8. Why are fibers considered class evidence? What is the most widely produced fiber in the world? What is the most widely produced synthetic fiber in the world? What is the unique property that each of the following synthetic fibers possesses? A. Kevlar B. Spandex C. Nylon Why does a camel hair fiber hold more value than a denim fiber? What is the ONLY way in which fibers can be considered individual evidence? Why is the dye used on a fabric considered a value piece of information to investigators? Be able to perform a microscopic examination, burn test, and chemical test on an unknown to determine its composition.