What is the purpose of performing a strand test before a chemical texture service?

• A. To determine processing time and curl pattern by evaluating hair's elasticity, porosity, and response to chemical processing.
• B. To assess shampoo compatibility.
• C. To measure hair thickness only.
• D. To select the correct color shade.

Answer: (A)

Strand testing is about predicting how hair will react to chemical processing. By applying the same solution to a small section, you can watch how the hair behaves—its elasticity (stretching without breaking), its porosity (how quickly it accepts and releases moisture and chemicals), and what kind of curl or straightening result emerges. This information guides the correct processing time and helps you anticipate the final curl pattern, so you don’t over-process or under-process and you avoid unnecessary damage. It also serves as a safety preview before treating the entire head. The test isn’t used to check shampoo compatibility, measure thickness alone, or pick a color shade.