What is the purpose of creating a scale cast of hair?

Creating a scale cast of hair is primarily used to assist in species identification. This technique involves taking an impression of the hair scales, which are part of the outer layer of the hair shaft. The patterns and characteristics of these scales vary significantly between different species. By examining the scale cast, forensic scientists and other researchers can compare the observed hair characteristics with known data from various species, allowing for accurate identification.

Other options, while related to hair examination, focus on different aspects. For instance, assessing the health of hair or examining hair color and texture does not leverage the unique scale patterns that are crucial for species determination. Identifying the chemical structure pertains more to the molecular composition and characteristics rather than the morphological traits visible in a scale cast. Thus, option C is specifically aligned with the unique purpose of creating a scale cast.