What is a strand test and why is it essential before a full color service?

• A. To measure porosity.
• B. A small test on hair to predict lift, shade outcome, and processing time; helps avoid surprises and damage.
• C. A test to determine scalp health.
• D. A test to assess moisture.

Answer: (B)

A strand test previews how the hair will respond to the color service by testing a small section with the planned formula. By treating that tiny sample the same way as the full service, you can see how much lift occurs, what the shade will look like, and how long processing should take. This early glimpse lets you adjust the formula, timing, or technique before applying it everywhere, so you avoid surprises like an out-of-range color, uneven tone, or overprocessing that can damage hair. In short, it predicts lift, shade outcome, and processing time, making the full color service safer and more predictable.