South Carolina Cosmetology Practice Exam

The elasticity of hair is determined by its ability to stretch and then return to its original shape. This characteristic is crucial for assessing the health and integrity of the hair. When a strand of hair is stretched, observing how well it rebounds indicates its elasticity. If the hair stretches but does not return to its original state, it may signify damage or lack of moisture, as healthy hair retains its elasticity. This property is important for stylists and cosmetologists to understand, as it can impact various treatments and styling techniques.

In contrast, observing color changes pertains to the pigmentation of the hair rather than its physical structure. Measuring strand thickness is relevant for understanding hair type and density, but it doesn't directly speak to the elasticity. Comparing to a non-stretched strand can provide a visual reference, but it does not actively test the elasticity itself, which is effectively assessed through the direct action of stretching and watching the reaction.