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What does hair elasticity refer to?

  1. Hair color

  2. Hair's ability to absorb products

  3. Hairs per square inch

  4. Hair's ability to stretch

The correct answer is: Hair's ability to stretch

Hair elasticity refers to the ability of hair to stretch and return to its original length without breaking. This is an important characteristic of healthy hair, as it allows for flexibility and resistance to damage. Option A, hair color, is an incorrect answer as elasticity has nothing to do with the color of hair. Option B, hair's ability to absorb products, is also incorrect as this refers to porosity, which is the hair's ability to absorb moisture and products. Option C, hairs per square inch, is incorrect as this refers to hair density and not elasticity. Hair elasticity specifically refers to the stretch and resilience of individual strands of hair.