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Hair and Fiber Microscopy (1207), August 19–23, 2024 In-Person

COURSE OUTLINE & SYLLABUS
Course schedule: 8:00 a.m. – 5:00 p.m. Monday – Thursday, and 8:00 a.m. – 12:00 p.m. Friday.
This is an introductory course for students wishing to acquire the theory, technique, and skills to characterize and identify hairs and man-made fibers at an advanced level. The emphasis of this course is on identification, but other characteristics of this class of materials are also treated, especially with respect to properties that may help to individualize or source them. It is recommended that the student has experience or previously taken McCrone Research Institute's Applied Polarized Light Microscopy (PLM) (1201) course, or the equivalent, before enrolling in this class.
Day 1
  • Introduction to the microscopy of fibers and hairs
  • The value and importance of reference collections and the best books and atlases of hairs and fibers
  • Microscopic hair morphology
  • Microscopic anatomy of hair and the techniques for studying it in the laboratory
  • Distinguishing human hairs from non-human animal hairs
  • Technique for the identification of animal guard hairs
  • Identification of animal fur hairs used as textile fibers
  • Human hair characteristics
Day 2
  • Types of man-made fibers and their production and effects on morphology and composition
  • Morphology of man-made fibers in longitudinal and cross-section
  • Whole mounts
  • Fiber inclusions and their identification and study
  • Technique for the preparation and study of cross-sections of single fibers
  • Introduction to the optical properties of fibers
Day 3
  • Optical properties: Determination of refractive indices, birefringence and sign of elongation of fibers, and their use in fiber characterization and identification
  • The standort diagram and its use in fiber identification
  • Determination of exact birefringence of high-performance fibers
  • Correlation of optical properties, chemistry, crystallography, and orientation of fibers
Day 4
  • Morphology of the woody and non-woody vegetable fibers
  • Microscopic anatomy of plant fibers
  • Technique for the study and identification of woody fibers
  • Technique for the study and identification of bast and leaf vegetable fibers
Day 5
  • Other techniques for fiber characterization and identification
  • Hot stage microscopy
  • Microchemical tests and fiber identification dyes
  • Laboratory examination of known-unknowns
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