Hair ServicesQuestion 345 of 484
Before applying an aniline-derivative oxidation hair color, how long in advance must a patch (predisposition) test be performed, and where?
a.12 hours before, on the forearm
b.24 to 48 hours before, behind the ear or on the inner elbow
c.5 minutes before, on the scalp
d.One week before, on the back of the neck
Explanation
Manufacturer instructions for aniline (PPD) tints require a patch test 24 to 48 hours before service, applied behind the ear or in the bend of the inner elbow. The area is observed for redness, swelling, itching, or blistering, any of which indicates the client should not receive the service.
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