Types of Fibers
What is the difference between natural and synthetic fibers?
Natural- made up of organic material
Synthetic- man-made/fake
Would fiber be considered class or individual evidence? Why?
Fibers would be class evidence because it can lead us back to a group or source, not an individual person.
What animal does the fiber wool come from?
Sheep
What is a fiber?
A fiber is the smallest unit of material that cannot be divided.
What is yarn?
Yarn is fibers spun together
What animal does the fiber angora come from?
Rabbits
What is the ideal time to collecting fibers from a crime?
24 hours
What animal does silk come from?
Caterpillars (cocoons)
What is the most common natural fiber that makes up our clothes?
Cotton
What is a textile?
Multiple yarn strands woven together
What plant does the fiber coir come from?
Coconuts
What type of test would you perform on a large sample of fiber evidence?
Burn test or dissolving in acid
What animal does the fiber cashmere come from?
Why would angora be more valuable than cotton if found at a crime scene?
Because angora is less common, it can lead to a more specific source, giving investigators a better lead.
What is the relationship between fiber, yarn, textile?
Fibers spun together make yarn and yarn woven together make a textile.
What fiber is made up of glass and why is it harmful to us if we breath it in?
Fiberglass. It is harmful because it can cause little cuts in our lungs damaging lung tissue and cause cancer.
What type of test would you perform on a single piece of fiber found at a crime scene?
Microscopy or Spectroscopy
What part of the plant does jute come from?
The stem of a plant
What is direct transfer for fiber evidence?
Direct transfer is when a fiber transfers directly from a source to a person or vice versa.
What is secondary transfer?
Secondary transfer is when fibers transfer from a source to a person then to another person.
What are three natural fibers?
1. Animal
2. Plant
3. Mineral
What are the three ways to collect fiber evidence?
1. Lifting (sticky tape)
2. Picking (tweezers)
3. Special vacuum
What animal does angora come from?
Rabbits
What are three things you are looking for when doing a burn test?
1. Smell
2. How the fiber burns
3. Ash residue
How do you find the horizontal/vertical thread count?
You count the amount of thread in that direction