Before a permanent wave, a strand test is performed mainly to:
a.Determine processing time and curl result on this specific hair
b.Calculate the developer cost
c.Check the client's blood pressure
d.Measure the room humidity
Explanation
A strand test (also called a test curl) shows how the client's hair will respond to the wave solution so the stylist can choose the right product and time, preventing over- or under-processing.
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