Hair and Fibers

True or False: A fiber is the largest unit of a textile material that has a length many times greater than its diameter.

• True

• False

Hair is composed of three principal parts:

• Fibers, cortex, cuticle

• Pigments, root, medulla

• Cuticle, Cortex, Medulla

________ fibers are man-made.

• Synthetic

• Natural

Tags

NGSS.MS-PS1-3

The transfer of evidence such as a fiber from a source to a person, then to another person or object, is called

• primary transfer

• secondary transfer

• tertiary transfer

• direct transfer

Early collection of fibers in an investigation is critical.  Within 24 hours, an estimated:

• 75% of all fibers fallen or lost

• 85% of all fibers fallen or lost

• 95% of all fibers fallen or lost

• None of the above

Which of the following fibers leave a white, fluffy ash when burned?

• acetate

• cotton

• polyester

• nylon

Tags

NGSS.MS-PS1-4

Which aspect of fibers make them difficult to use as evidence in an outdoor crime scene?

• they are difficult to identify

• they are easily contaminated by other fibers

• they are easily destroyed by light

• they are easily blown away

In which phase of hair growth is hair actively growing?

• anagen

• catagen

• telogen

• melanen

Tags

NGSS.HS-LS1-4

The deepest layer of hair (compared to the lead of a pencil) is the ___

• medulla

• cortex

• cuticle

• keratin 

Hair color comes from a pigment called

• Hair dye

• Melanin

• Paint

• Genes

Tags

NGSS.MS-LS3-1

NGSS.MS-LS1-5