What is the purpose of performing a burn test on hair?

Performing a burn test on hair is primarily used to identify human hair from synthetic hair. This test involves taking a small strand of hair and burning it to observe the characteristics of the ash and the smell produced. Human hair tends to burn slowly, producing a distinct odor similar to burnt protein, while synthetic hair burns quickly and can create toxic fumes, often melting in the process. This difference in reaction provides a clear distinction between natural and synthetic hair, making it an essential method in the hair and beauty industry for professionals to accurately assess their materials.

The other options focus on aspects like elasticity, moisture content, and color durability, which are not determined through a burn test. Elasticity can be assessed through manual stretching, moisture content is evaluated through specialized testing techniques, and color durability is typically checked through other methods like fading tests rather than combustion.