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Making A Hair Slide Final

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by

Stephen Polacheck

on 30 March 2016

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Transcript of Making A Hair Slide Final

Making a Hair Slide
Stephen Polacheck
Brian Weiss
Austin Mislevy
f rensics

Steps 1-2

1) Thoroughly clean the hair or tissue you are trying to cast, by pulling it through a tissue, or cotton ball moistened with isopropyl alcohol

2) Apply a very thin layer of clear nail polish to a glass slide in a stripe
Steps 3-4
3) Lay the hair on the slide

4) Allow the polish to dry, and lift the hair out, by the root end
Steps 5-6
5) An imprint of the hair should be visible on the polish

6) Place the slide on microscope and begin viewing on the lowest magnification.
Steps 7-8
7) Compare the cast to the actual hair

8) Draw/record your observations
Differences
Hair vs Fibers

Hair is made of cells
Can be "Individual" or "Class" evidence
Cuticle (outermost scale layer)
Cortex (spindle shaped cells inside cuticle)
Medulla (central canal)

Fibers have none of these
Differences
Human hair vs Animal Hair

Animal Hair stops growing at a certain length.
Human Hair keeps growing.

Animal medulla is more than half the width of the hair
Human medulla is less than 1/3 the width of the hair

DNA differences
THE END
Full transcript