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Hair and Fiber Warm-up (11/13/2024)

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Last updated about 1 year ago
13 questions
11/13
11/14
Required
1
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1
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1
Table 4.2
11/15
Required
2
11/18
11/19
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1
1
1
Question 3
3.

During which phase(s) of hair growth is the follicle actively receding from the hair shaft?

Question 4
4.

Question 5
5.

Question 6
6.

Required
1
Question 7
7.

Give the definition of a fiber and an example of a fiber.

Required
1
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1
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1
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2
Question 12
12.

What type of weave pattern is shown? _______
Required
1
Question 1
1.

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Question 2
2.

Hairs shed during the telogen phase of growth will most likely not contain
mitochondrial DNA
nuclear DNA
keratin
medulla
Categorize the following fibers as natural or synthetic.
nylon
cashmere
linen
elastane
wool
asbestos
natural
synthetic
Categorize the following textile samples by their weave patterns.
plain
satin
twill
Question 8
8.

What are the four classes of fibers?

Question 9
9.

Explain the difference between a destructive and nondestructive test.

Question 10
10.
An unknown fiber is tested using the burn test to determine its identity. The fiber stops burning when removed from the flame, smells putrid (like burnt hair), and creates a brittle, crumbly black residue.

The fiber's identity is __________.
Question 11
11.
There is a mystery textile on your table. Perform a burn test on one of the threads, and use the dissecting microscopes to determine the weave pattern.

type of fiber (determined by burn test): _______

weave pattern (determined through microscopic analysis): _______
Question 13
13.

Match the stage of hair growth with its appropriate description.
catagen stage
active growth period of hair; 80--90% of hairs are in this phase for humans
telogen phase
period where follicle recedes and the blood supply is reduced
anagen stage
hair follicles are dormant during this stage; hairs are easily shed
These 100 shed hairs would most likely be in the ________ stage.
anagen
catagen
telogen
Rank the following fibers in terms of their uniqueness and potential value to an investigation.

TOP = most unique/potentially important
red dyed cotton
white cotton
cashmere fibers
white cotton that was recovered 3 days after the initial crime