The Atlas of Human Hair Microscopic Characteristics fills a void in the resources available to researchers and practitioners in forensic hair examination by providing photographic archetypes for the microscopic characteristics of human hair and the varieties of the characteristics seen in forensic examinations, including curl; color; pigment distribution and density; cortical fusi; and ovoid bodies. It also explains a numerical scoring system that allows numerical description of hair type, which can then be compared to others in a database.