Sources of Fiber
Characteristics of Fiber
Hair Structure
Whose hair is it anyway?
Hair and Fiber as Evidence
100
this is the most common plant fiber
What is cotton?
100
This type of natural fiber is strong and durable.
What is linen?
100
Melanin granules in the cortex give the hair this quality.
What is its color?
100
This part of the hair can be analyzed for DNA.
What is the root/follicle?
100
This is the smallest indivisible unit of a textile.
What is a fiber?
200
Silk comes from this animal.
What is a caterpillar, silkworm, spider, or goat?
200
This is the most common synthetic fiber.
What are polyester?
200
The hair shaft is composed of these three parts.
What are the cuticle, cortex, and medulla?
200
What type of cuticle pattern is this?
What is coronal?
200
These three tools can be used to collect fibers from a crime scene.
What are special vacuums, sticky tape, and forceps?
300
A monomer is a small molecule that may bond together to form a long chain of this material, found in polyester.
What is a polymer?
300
This class (group) of fibers is less heat-resistant.
What is synthetic fibers?
300
This is the outer layer of the hair follicle.
What is the cuticle?
300
What type of cuticle pattern would be found in a human, mouse, and cat - respectively (in order)?
What is Imbricate, coronal, spinous?
300
The hair shaft is this kind of evidence.
What is class evidence?
400
What is the cellular material that makes up plant fibers?
What is cellulose?
400
When evaluating fiber evidence, two fibers of the same color can be differentiated using what test?
What is chromatography?
400
What type of medulla pattern
__ __ __ __ __ __ __
What is interrupted?
400
If hair has a medulla width if 5mm and a hair width of 25mm. Is it animal or human?
Medullary index = width medulla/ width hair
What is human?
400
This type of transfer occurs between victim and suspect.
What is direct transfer?
500
This fabric comes from rabbits.
What is angora?
500
Give AT LEAST 3 major differences between Natural and Synthetic Fibers
Natural - Animal, Plant, Mineral Sources; Uneven and Irregular Texture; Presence of Cuticle
Synthetic - Man-made; Contains Petroleum; Smooth Regular Texture and Surface; No Cuticle
500
Animal or human hair?
What is animal?
500
List 3 Class pieces of information you can get from hair
Toxin History, Diet, Hair Color, Dyed/Bleached, Nutrition, Animal/Human
500
Approximately 95% of fibers may fall off a victim within what span of time?
24 hours