Forensic Fibers

what is a thread that is used to make textiles, ropes, and other products?

fibers

what are the 2 types of fibers?

natural and manufactured

natural fibers are from

plants and animals

manufactured fibers are from

polymers

what type of test does NOT destroy the sample fiber

microscopy

what type of test does destroy the sample fiber

burn

what is the most common natural fibers

plant fibers

what fibers look like flat, slightly twisted ribbons under the microscope

plants fibers

where does cotton come from?

cotton

what fibers burns with yellow flame, smells like burning paper and has gray to charcoal colored ash that easily crumbles

cotton

what fiber can you see the hair cuticle and medulla under the the microscope

animal

what fiber is from sheep?

wool

what fiber will burn itself out, smell like burnong hair and residue is black bead that can be crushed into powder

wool

what was the 1st artificial fiber from wood

rayon

what was the 1st synthetic fiber

nlyon

what is known as synthetic wool

aryclic

what is the most common synthetic fiber

polyester

what fiber is made from wood

rayon

what fiber has striations running through the fiber?

rayon

what fibers burns with yellow flame, smells like burning paper and has gray to charcoal colored ash that easily crumbles

rayon

what fiber is made from coal?

nylon

what fiber melts, smells like burning garbage, and residue is round and shiny bead that hardens gray or brown

nylon

what fiber is made from petroleum?

acrylic

what fiber melts quickly, releases black smoke, and has a faintly sweet or even “fishy” smell

acrylic

what fiber is made from petroleum?

polyester

what fiber melts & burns, has thick black smoke, and chemical odor

polyester

if you smell burning hair, the fiber is

animal

if you smell burning paper, the fiber is

plant

if the fiber melts it is

manufactured

What is the cuticle?

Scale structure covering the exterior of the hair

What is the medulla?

A cellular column running through the center of the hair.

What is the Cortex?

The main body of the hair shaft