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Unit 6 - Fibers

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

Can fiber evidence have probative value?

Back (Answer)

Yes

#2
Front (Question)

Characteristics of synthetic fibers

Back (Answer)

Uniform and regular shape of cross section Stronger More chemically inert

#3
Front (Question)

Can a piece of fabric be individualized to a particular garment?

Back (Answer)

Yes, but only if the piece fits a tear or rip in the garment.

#4
Front (Question)

Can a fiber be individualized to a particular garment?

Back (Answer)

No. Fibers are class evidence.

#5
Front (Question)

Difference between a fabric and a fiber

Back (Answer)

Fabric - made from fibers Fibers - made of twisted elements that are either natural or artificial.

#6
Front (Question)

Is silk synthetic or natural?

Back (Answer)

Natural

#7
Front (Question)

Most common type of natural fiber

Back (Answer)

Cotton

#8
Front (Question)

Most common type of synthetic fiber

Back (Answer)

Nylon

#9
Front (Question)

Can an investigator use the way a fabric accepts a specific dye to identify and compare samples?

Back (Answer)

Yes

#10
Front (Question)

Optical microscopy

Back (Answer)

The most important method of fiber identification Involves polarizing light and comparison microscopes

#11
Front (Question)

Electropherogram

Back (Answer)

Plot of results from an analysis done by electrophoresis

#12
Front (Question)

Natural fibers

Back (Answer)

Cotton Wool Linen Silk Cashmere Jute

#13
Front (Question)

Synthetic Fibers

Back (Answer)

Nylon Polyester Acrylic Plastic Rayon Acetate Dacron

#14
Front (Question)

Polymer

Back (Answer)

A molecule consisting of many repeating units. Can be naturally occurring or synthetic.

#15
Front (Question)

Are all fibers polymers?

Back (Answer)

Yes

#16
Front (Question)

What types of tests can be used to test the dye in a particular fiber?

Back (Answer)

Chemical tests or chromotography

#17
Front (Question)

Is linen natural or synthetic?

Back (Answer)

natural

#18
Front (Question)

For there to be an association between a questioned fiber and an unknown fiber, what percentage of tests you run on the two samples must have identical results?

Back (Answer)

100% One off means the two fibers cannot be associated.

#19
Front (Question)

What was the first truly synthetic fiber to be discovered and sold?

Back (Answer)

Nylon

#20
Front (Question)

What fiber will fluoresce under ultraviolet light?

Back (Answer)

Cotton

#21
Front (Question)

The Amanda Davies case showed the importance of what?

Back (Answer)

fiber transfer

#22
Front (Question)

First person convicted on the basis of fiber evidence

Back (Answer)

Wayne Williams

#23
Front (Question)

Tests that can be done in lab to analyze fibers (in addition to what we did in class)

Back (Answer)

refractive index, any type of chromotography, optical microscopy any infrared study

#24
Front (Question)

Properties that should be examined when comparing two fibers

Back (Answer)

birefringence diameter color cross-section fluorescence