Animal Fibers
Synthetic Fibers
Plant Fibers
Burn Tests
Hairs
100
Name two animal fibers
Wool, silk, cashmere
100
Name two synthetic fibers
Rayon, acrylic, nylon, polyester, spandex
100
Name two plant fibers
Cotton, linen, hemp, jute
100
Plant, animal, or synthetic? Smell: Burning Hair Flame: Small flickering flame, brittle ash, no smoldering Withdrawn: Self-extinguishing
Animal (wool)
100
What are the three types of hair we analyze in Crime?
Cat, dog, human
200
Name the fiber:
Wool
200
Name this fiber:
Polyester
200
Name this fiber:
Cotton
200
Plant, animal, or synthetic? Smell: Celery Flame: Orange, hard bead produced Withdrawn: Self-extinguishing
Synthetic (nylon)
200
What are the three parts of the hair shaft?
Cortex, cuticle, medulla
300
What are animal fibers made of?
Keratin and/or other proteins
300
What are synthetic fibers made of?
Hydrocarbons
300
What are plant fibers made of?
Cellulose and/or other carbohydrates
300
What fiber matches these results?
Smell: Burning grass Flame: yellow, burns constantly, sparks Withdrawn: Continues to burn, burns completely
Linen
300
What are the three/four phases of the hair cycle?
Anagen, catagen, telogen, exogen
400
What is wool made of and from?
Sheep and made of keratin.
400
What are synthetic fibers used in? (That other fibers aren't)
Used in many products, including activewear, swimwear, socks, footwear, and intimate apparel.
400
What is the cheapest plant fiber?
Jute
400
What fiber matches these results?
Smell: sweet/chemical Flame: Burns quickly, hard cream or black colored bead that cannot be rushed Withdrawn: Continues to burn
Polyester
400
How can you tell if human hair is damaged in an image given on a test?
It will have uneven texture, breakage, and frayed ends
500
Are animal fibers water resistant? (1/2 points) If so, why?
Yes, The cuticle of animal fibers contains fatty acids that make the fiber water repellent.
500
What was the first synthetic fiber created? (1/2 points) When was it developed?
Nylon; 1935
500
What part of the plant do plant fibers come from?
Plant fibers come from the outer portion of the stems of fibrous plants, or from the leaves of other plants
500
Name the fiber that has these results: Smell: Burning Paper Flame: amber or yellow, slow burning, fluffy, greyish ash Withdrawn: Continues to burn
Cotton