Chemical ServicesQuestion 83 of 100
A patch (predisposition) test is performed before certain color services to:
a.Check the hair's length
b.Measure the pH of the scalp
c.Determine curl pattern
d.Detect a possible allergic reaction to the product
Explanation
A patch test applies a small amount of product, often behind the ear or on the inner arm, 24 to 48 hours ahead to see whether the client reacts. It is especially important for aniline-derivative (oxidation) tints that can cause allergic reactions.
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