CHY 183 Chapter Notes - Chapter 11+12: Pyrolysis, Beta Particle, Atomic Mass
Document Summary
Forensics chapter 11 + 12 textbook summary: trace evidence. * the shaft is composed of three layers (cuticle, cortex, medulla) and is most intensely examined. * cuticle: scale pattern studied by making a cast of it. * cortex: main body, embedded in pigment granules that give hair it"s color. * medulla: medullary index measures diameter of medulla. * 3 stages of hair growth within the root are anagen (initial growth, follicular tag created to individualize hair), catogen (transition) and telogen (hair naturally falls out of skin) * microscopic examination to reveal morphological features to distinguish human hair (scale structure, medullary index and medullary shape) * to compare hair scientist is most interested in color, length and diameter, as well as the presence of a medulla and the distribution, shape and color intensity of the pigment, and if the color is natural or dyed/bleached.
