This document discusses the analysis of hair and textile fibers found at crime scenes. It explains that hair and fibers are analyzed for characteristics like DNA, color, length, and diameter to identify suspects in cases of rape and drug crimes. The document also differentiates between hair, which has a cuticle and medulla, and various textile fibers which can be animal, plant, or synthetic fibers and may lack these structures. Analysis is done using micro spectrophotometers to measure microscopic samples.

1. Hair
and
Textile fiber

2. Hair and Fiber Analysis
• During crimes scenes , hair and fibres are
usually encountered.
• They are analyzed for DNA, color, pigments
length and diameter.
• They are the most commonly used to analyze
a rape or drug case to identify the suspect

3. Basic Visual Comparison of
Hair and Fiber
HAIR
• Irregular Only
• Always circular
• Visible structural
features: cuticle and
medulla.
FIBER
• Uniform and Irregular
types
• Variety of shapes
• Absence of cuticle
and medulla.

4. What is Medulla and Cuticle

5. Different textile fiber
• Animal fiber
are used in the manufacturing of jackets,
blankets and other types of clothing.

6. • Plant fiber
cotton, jute and bamboo fibre are all used in
clothing.

7. • Synthetic fiber
Nylon fiber is usually used to imitate silk. They
are also used in the production of ropes and
outdoor clothing.

8. How are all of these fiber analyzed?

9. Micro spectrophotometer
• Micro spectrophotometer are designed to
measure spectra of a microscopic sample.