Hair ServicesQuestion 165 of 484
Why must a strand test be performed before applying a chemical relaxer to a new client?
a.To preview the final haircut shape
b.To measure shampoo viscosity
c.To predict processing time and confirm the hair can withstand the chemical without breaking
d.Only to choose between perfume scents
Explanation
A strand test (also called a preliminary test) applies the product to a small section and times the result. It confirms the hair has the strength and integrity to tolerate the relaxer and reveals how long the chemical needs to process safely, reducing the risk of breakage on the whole head.
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