What test checks elasticity before processing?

• A. Pull test
• B. Scratch test
• C. Bend test
• D. Spin test

Answer: (A)

Elasticity is about how well a hair strand can stretch and then return to its original length without breaking. Before processing, you want to know if the hair can withstand the stress of chemical services. The pull test does this by gently pulling on a small strand to see how it behaves. If the strand stretches and returns, the hair has good elasticity and is a viable candidate for processing. If it breaks easily or doesn’t stretch much, elasticity is poor, and you’d adjust your approach or avoid processing for that strand. The scratch test relates to porosity by evaluating how easily the cuticle is damaged, not to stretchability. Bend and spin tests assess different aspects of hair behavior, so they aren’t the standard measure of elasticity before processing.