FIBERS

PROBLEM WITH FIBER

• FIBERS CANNOT PINPOINT AN OFFENDER IN ANY DEFINITE MANNER

CROSS TrANSFER OF FIBER

• Occurs when person to person contact

HOW FIBERS ARE GATHERED

• With Tweezers, Tape, or Vacumm

FIBER ORIGINS

• Clothing, drapery, wigs, carpeting, furniture, and blankets.

ANALYZING FIBERS

• They are first determined to be natural, manufactured, or a mix of both.

NATURAL AND MANUFACTURED FIBERS

• Natural fibers come from plants (cotton) or animals (wool).
• Manufactured fibers are synthetics like rayon, acetate, and polyester.

DETERMINING THE SHAPE AND COLOR

• A long thorough microscopic examination is made.

EVERY FIBER COUNTS

• Generally, the analyst gets only a limited number of fibers to work with.
• Sometimes one.

FIRST STEP

• The first step in fiber analysis is to compare color and diameter.

CHROMATOGRAPHY

• Uses solvents to separate the dye's chemical constituents