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