Fibers are commonly found with burglary, assault, breaking and entering, and hit and run accidents. Fibers can come from clothes, carpet, curtains, wigs.

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Presentation transcript:

Fibers are commonly found with burglary, assault, breaking and entering, and hit and run accidents. Fibers can come from clothes, carpet, curtains, wigs and furniture.

Natural Fibers  Produced entirely from plants or animals  Animal Fibers-  Sheep-wool  Goats-mohair and cashmere  Camels  Llamas  Rabbit  Mink  Plant Fibers-  Cotton

Man-Made Fibers  Regenerated Fibers- produced using natural raw materials (ex. Rayon made from cellulose)  Synthetic Fibers- produced using synthetic chemicals (ex. Nylon made from petroleum and polyester made from thermoplastic polymer resin)

Identification Using Fibers  “Fit together” like puzzle pieces when fabric is torn- conclusive evidence.  Microscopic comparison- color, diameter, striations  Color comparison of specific dyes used with micro- spectrophotometer or chromatography.  Chemical composition-make sure fibers are from the same generic class and subclass with infrared spectrophotometry.