Flashcards in Hair And Fiber Deck (24):
The region of a hair located outside of the medulla containing granules of pigment
The tough outer covering of hair composed of overlapping scales
The actively growing root or base of a hair containing DNA and living cells
The central core of a hair fiber
Bits of pigment found in the cortex of a hair
Small but measurable amounts of physical or biological material found at a crime scene
The passing of evidence, such as fiber from victim to suspect or vice versa
The smallest indivisible unit of textile, it must be at least 100 times longer than wide
A fiber produced naturally and harvested from animal, plant or mineral sources
A fiber made from a man made substance, such as plastic
The transfer of evidence , such as fiber from a source to a person, and then to another person
A flexible, flat material made by interlacing yarn
Fibers that have been spun together
A compound microscope that allows the side by side comparison of samples such as hair and fibers
What are the 3 different types of medullas of hair
What are the 3 types of cuticles of hair?
What are 2 differences between animal and human hair?
In animal medulla is present for all animals and cuticle is spinous or coronal
In humans there can be no medulla and the cuticle is imbricate.
Which cuticle patterns are NEVER found in humans?
What kind of evidence are fibers? Why
CLASS evidence because fibers can't be assigned to a single person or thing.
What kind of evidence is hair?
Class evidence because it cannot be used to identify a specific individual.
Are rayon, polyester, nyon, acrylic, and olefin natural or synthetic fibers?
Are wool, silk and cotton synthetic or natural fibers?
What are other ways that you can analyze fibers
Polarized light microscopy, or infrared spectroscopy and tests for solubility in different solutions