FIBERS

PIPOINT

• Unlike finger prints or DNA they cannot pinpoint an offender.

COLLECTING

• Fibers are gathered at a crime scene with tweezers, tape, or a vacuum.

TYPES

• Natural fibers come from plants (cotton) or animals (wool).
• Manufactured fibers are synthetics like rayon, acetate, and polyester.
• Which are made from long chains of molecules called polymers.

FIBER ANALYST

• Fiber analyst compares shape, dye content, size, chemical composition.

SPECTOMETER

• spectrometer.
• which separates light into component wavelengths

MICROSCOPE

• compound microscope

COMBINE

• A combination of the microscopes
• micro-spectrophotometer

SMALL DETAILS

• Under a microscope, the analyst looks for lengthwise striations.
• pits on a fiber's surface, or unusual shapes

MORE

• Then a spectrophotometer measures the light intensities
• yields a way to identify different types of substances.

Absorption Lines

• specific wavelengths
• selectively absorbed into the substance