5.1 QUIZ - Fiber & Textile Analysis

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

• 75% of all fibers may have fallen from a victim or been lost from a crime scene.
• 85% of all fibers may have fallen from a victim or been lost from a crime scene.
• 95% of all fibers may have fallen from a victim or been lost from a crime scene.
• None of these choices.

Which tools below are used to collect fiber evidence? Choose ALL that apply.

• bare hands
• forceps/tweezers
• household vacuums
• sticky tape/sticky notes

Which of the following methods can be used to analyze fibers without damaging them? Choose ALL that apply.

• burn test
• chemical test
• polarizing light microscopy
• infrared spectroscopy

Natural fibers come from _______________.

• animal sources, only
• chemical synthesis
• plant sources, only
• plant and animal sources

Which of the following would be classed as a synthetic fiber?

• wool
• polyester
• cotton
• silk

Which of the following would be classed as a completely natural fiber?

• acrylic
• hemp
• nylon
• rayon

True or False? Synthetic fibers are ALL made from petroleum and are cellulose-based fibers

• True
• False

True or False? Fibers are woven into textiles or fabrics.

• True
• False

True or False? A forensic lab technician conducts a burn test on a piece of fabric. The fabric begins to melt and form beads and smells of burning plastic. This fabric is likely made of natural fibers.

• True
• False

True or False? The weave pattern shown below is a plain/tabby weave

• True
• False