Which factor is NOT typically examined when assessing a client's hair characteristics?

When assessing a client's hair characteristics, factors such as density, porosity, and texture are typically evaluated because they provide crucial information about the hair's condition and how it will react to various treatments and styling techniques.

Density refers to the number of hairs per square inch on the scalp and helps determine the fullness of the hair. Porosity indicates how well hair can absorb and retain moisture, which is essential for selecting appropriate products and treatments that will benefit the hair. Texture describes the diameter of each individual hair strand (fine, medium, coarse) and influences styling methods and product selection.

Length, while relevant for certain services and visual appeal, does not directly inform stylistic decisions or treatment efficacy in the same way the other characteristics do. Length is more of a measurement rather than a characteristic that affects the hair's behavior or health. Thus, it is not typically considered when assessing a client's hair characteristics in the context of service preparation and product choice.