The elasticity test assesses damage to which part of the hair prior to a chemical or styling service?

The elasticity test assesses damage to which part of the hair prior to a chemical or styling service?

• A. Cuticle
• B. Cortex
• C. Medulla
• D. Outer surface

Answer: (B)

Elasticity tests measure how well hair can stretch and snap back, which reflects the integrity of the cortex—the middle layer where most of the hair’s strength and elasticity reside. When chemical treatments or styling damage the hair, the cortex can lose its bonds and structure, making it harder for the hair to recover its original length after being stretched. The cuticle is the protective outer layer; its condition affects surface feel and shine but isn’t what primarily governs elasticity. The medulla, if present, is a soft core and doesn’t play the main role in elasticity for most hair types. Outer surface essentially refers to the cuticle, which again is not where elasticity originates. Therefore, the elasticity test best assesses damage to the cortex.

Elasticity tests measure how well hair can stretch and snap back, which reflects the integrity of the cortex—the middle layer where most of the hair’s strength and elasticity reside. When chemical treatments or styling damage the hair, the cortex can lose its bonds and structure, making it harder for the hair to recover its original length after being stretched. The cuticle is the protective outer layer; its condition affects surface feel and shine but isn’t what primarily governs elasticity. The medulla, if present, is a soft core and doesn’t play the main role in elasticity for most hair types. Outer surface essentially refers to the cuticle, which again is not where elasticity originates. Therefore, the elasticity test best assesses damage to the cortex.