Hair 1
Can a strand of hair alone (without the follicle) solve a crime?
No
List one characteristic of East Asian hair strands.
Strait, large circular shape, 500,000 strands per head, etc.
There are multiple ways to collect fibers what are two of them?
tape/adhesive, vacuum, forceps
The two broad categories for fibers.
What are natural and synthetic
Why can hair with a follicle solve a crime?
It contains DNA. Which can be matched.
Most humans tend to have a medullary index of what?
Less than 0.3
What chemical test can we preform on unknown fibers?
Burn test
List two of the three types of natural fibers
plant, animal & mineral
How can human hair be classified as either class or individual evidence?
It can either have a root attached or not.
A medula that looks like a dotted line.
What is interrupted medulla
Fibers in forensics are considered what type of evidence?
Trace evidence
What fabric pattern type is characterized by a diagonal lines?
Twill
List the three main parts of the hair from the outside to the inside.
Cuticle, cortex, medulla
Arsenic
What are two differences between animal hair and human hair?
Animals have a larger medulla, animals have drastic color changes, etc.
How do you calculate thread count?
What fabric melts quickly when applied to a flame, is synthetic, puts off a chemical odor and creates white smoke?
Nylon
Why are forensics scientists able to track chemicals in hair strands?
Your hair keeps track of it all, because your hair contains all of the things you have ingested in a certain time period depending on the length of the hair.
Intermittent or interrupted medulla is a regular pattern, whereas this type of medulla has segments of irregular size/length and has very thin sections.
What is fragmented?
What fabrics ultimately led to the imprisonment of Wayne Williams? (name 2)
Green carpet fibers, purple bedspread, or yellow blanket.
List 3 different synthetic fibers
Nylon, polyester, polyester, rayon, etc.