Hair I
Hair II
Fiber I
Fiber II
Misc.
100
What is the outermost layer of the hair shaft?
Cuticle
100
What are the layers of the hair shaft going form outside to inside?
cuticle, cortex, medulla
100
Fibers are classified into what 2 categories?
natural and synthetic
100
Where do silk fibers come from?
silkworm
100
What is the purpose of our hair?
Insulation
Camoflauge
Beauty
200
Which cuticle pattern do humans have?
imbricate
200
What are the 2 cuticle patterns that humans do not have?
spinous and coronal
200
What animal produces cashmere?
Goats
200
What is the most common plant fiber?
cotton
200
On average, how many hairs do we lose a day?
On average, how many hairs do we have on our scalp?
about 100
100,000
300
What are the 3 stages of hair growth?
anagen
catagen
telogen
300
During which stage is hair actively growing?
anagen phase
300
What textile pattern is this?
Twill
300
What plant fiber is thicker and often used to make ropes?
hemp
300
Scalp hair spends most of its time in the anagen phase.
True or False
True
400
During which stage of hair growth does hair most easily come out?
telogen phase
400
In which hair layer do yoou find the hair color?
cortex
400
What are fiberglass fibers used for?
Building insulation
400
Who was convicted larelgy/solely on fiber evidence?
Wayne Williams (Atlanta Child Murderer)
400
When you get samples from both the victim and suspect (s) to compare to what was found at a crime scene, what are those samples called?
standard or reference samples
500
What is the medullary index for human hair?
0.33 or less
500
how do you calculate the medullary index?
diameter of medulla/diameter of hair shaft
500
Which was the first man-made fiber?
Rayon
500
What type of wevae pattern is this?
Satin
500
What type of evidence was used to convict Casey Anthony?
Indirect
Direct
Indirect