forensics unit 4

willow spring high school

parts of the hair

cuticle, cortex, medulla, pigment granules

components of the hair

keratin, melanin, trace metals, metallic elements

cuticle patterns

coronal, spinous, imbricate (flat)

types of medulla

continuous, interrupted, fragmented, solid, none

cross section for asian hair

round

cross section for caucasian hair

oval

cross section for african hair

flat oval

two types of fibers

natural (animal/plant), man-made (chemical)

coir (coconut)

plant fiber

cotton

plant fiber

hemp, jute, flax

stem fibers

manila (abaca tree)

leaf fibers

wool

animal fiber

mohair, cashmere

goat fiber

mink, rabbit

fur fiber

pet hair

animal fiber

cotton

most common

man made fibers

regenerated, synthetic

regenerated

natural fibers treated with cellulose

rayon, acetate, triacetate

regenerated

synthetic

solely man-made using chemicals

nylon, polyester, acrylics

synthetic fibers

if it continues burning and liquefies

spandex (synthetic)

if it continues burning and turns to a hard bead

polyester (synthetic)

if it continues burning and turns into crunchy ash

wool (natural/animal)

if it continues burning and has no residue

cotton (natural/plant)

if it self-extinguishes and turns into black ash

silk (natural/animal)

if it self-extinguishes and turns to a yellow liquid

nylon (synthetic)

if it has no reaction

linen (natural/plant)