What is a strand test used to determine?

• A. To determine how the hair will react to color on a strand
• B. To test skin sensitivity
• C. To measure growth rate
• D. To check color on strands

Answer: (A)

Strand tests are used to predict how hair will respond to a color formula by testing a small section. This shows how much lift or deposit the hair will take, how the formula will develop with that hair’s porosity and current color, and what the final shade is likely to look like. It also helps confirm the expected processing time and whether any adjustments to the formula are needed before treating the whole head. Skin sensitivity testing is done separately to check for allergies, not the hair’s color reaction. Growth rate isn’t related to how hair reacts to dye. While you can observe color on a strand during the test, the main purpose is to determine the hair’s reaction to the color on that strand to guide the full color service.