Hair and Fiber Fest

1) This is a hair sample taken from a human. Please refrain from moving the slide.

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.

1

Which weave pattern is present in this fabric sample?
__________

1

Which of the following options is the most likely identity of the fabric?

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

Is the fiber natural or synthetic?
__________

What type of fiber is the yarn made of?__________

4) This is a textile sample taken from the exotic land of Joann's Fabrics. Use the microscope to make observations.

1

What type of weave pattern is this?

1

The weft thread crosses under how many warp threads before crossing over again? _______ 

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.

2

Which type of medulla pattern is present? __________

Which scale pattern is present?
__________

2

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)

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.

1

What type of weave pattern is shown?

1

List 2 qualities that improve the value of this fiber as evidence and explain why.

7) This is an unknown hair taken from a cave where an alleged killer used to hang out...

PLEASE DO NOT MOVE THE SLIDE.

1

What type of scale pattern is present?

1

In your expert opinion, is this an animal hair or a human hair? Explain how you know.

8) Use the dissecting microscope to analyze the fabric.

1

What type of weave pattern is this?

9) MYSTERY THREAD

Determine the identity of the thread BY ANY MEANS NECESSARY (except physical violence - that's not cool).

1

What is the identity of the unknown fiber?
_______ 

What pigment is responsible for the coloring of hair?

What type of medulla pattern is present?

Which of the following options is the most likely identity of the fabric?

What type of weave pattern is this?

What type of weave pattern is shown?

List 2 qualities that improve the value of this fiber as evidence and explain why.

What type of scale pattern is present?

In your expert opinion, is this an animal hair or a human hair? Explain how you know.

What type of weave pattern is this?