Which statement about the strand test for lightener is true?

The statement that multiple strand tests can be done with various developers and lighteners is important because it underscores the necessity for assessing how different products react on a client’s hair. A strand test is a crucial step in hair coloring, particularly when using lighteners, as it helps predict the outcome and ensure the desired level of lift or tone.

Using multiple strand tests allows professionals to explore different results that can arise from varying strengths and formulas. Different developers can impact the lightening process differently depending on the hair’s condition and the specific lightener used. This means that by performing multiple tests, the stylist can better tailor the approach to the unique characteristics of the hair, ensuring a safe and satisfactory result.

The other options, while reflecting certain practices, do not accurately capture the flexibility and customization that strand testing allows in professional hair coloring services.