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Hair and Fiber Fest
By Robert Ly
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Last updated about 1 year ago
15 questions
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1)
This is a hair sample taken from a human. Please refrain from moving the slide.
1
1
2)
This station is a microscope and hand sample of the fiber!
There is a small sample of the fiber to the right of the microscope - perform a burn test on it using the forceps and candle.
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1
3)
This station consists of a microscope slide and a piece of blue yarn. A few fibers from the yarn are placed under the microscope for you to view.
If you perform a burn test, cut a piece of the yarn.
DO NOT BURN THE ENTIRE YARN.
2
4)
This is a textile sample taken from the exotic land of Joann's Fabrics. Use the microscope to make observations.
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Question 7
7.
5)
This is a hair recovered from a crime scene. One slide contains the hair itself, while the other contains the cuticle impression.
Please do not move either of the slides.
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2
6)
This is an unknown fabric recovered from the depths of Mr. Ly's closet.
If you choose to utilize the burn test, only burn 1 thread please.
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7)
This is an unknown hair taken from a cave where an alleged killer used to hang out...
PLEASE DO NOT MOVE THE SLIDE.
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8)
Use the dissecting microscope to analyze the fabric.
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9) MYSTERY THREAD
Determine the identity of the thread
BY ANY MEANS NECESSAR
Y (except physical violence - that's not cool).
1
Question 1
1.
Question 2
2.
Question 3
3.
Which weave pattern is present in this fabric sample?
__________
Question 4
4.
Question 5
5.
Is the fiber natural or synthetic?
__________
What type of fiber is the yarn made of?__________
Question 6
6.
The weft thread crosses under how many warp threads before crossing over again? _______
Question 8
8.
Which type of medulla pattern is present? __________
Which scale pattern is present?
__________
Question 9
9.
Suppose that the diameter of the hair measures 113 microns and the width of the medulla is 85 microns.
Calculate the medullary index: _______ (round to 2 decimal places)
Is this hair from a human or nonhuman?
_______ (type human or nonhuman)
Question 10
10.
Question 11
11.
List 2 qualities that improve the value of this fiber as evidence and explain why.
Question 12
12.
Question 13
13.
In your expert opinion, is this an animal hair or a human hair? Explain how you know.
Question 14
14.
Question 15
15.
What is the identity of the unknown fiber?
_______
What pigment is responsible for the coloring of hair?
carotene
melanocytes
melanin
keratin
What type of medulla pattern is present?
fragmented
segmented
absent
continuous
Which of the following options is the most likely identity of the fabric?
cotton
rayon (viscose)
wool
polyester
silk
What type of weave pattern is this?
leno
twill
plain
satin
What type of weave pattern is shown?
twill
satin
leno
plain
What type of scale pattern is present?
spinous
coronal
angular
imbricate
What type of weave pattern is this?
satin
plain
twill
leno