Question

To identify any possible allergies to hair color, the FDA requires that a patch test be given to a client ______ hours prior to each application of an aniline derivative hair color.

Answer 1

A patch test for allergies to hair color should be administered 24 to 48 hours before applying an aniline derivative hair color as required by the FDA.

Step-by-step explanation:

To identify any possible allergies to hair color, the FDA requires that a patch test be given to a client 24 to 48 hours prior to each application of an aniline derivative hair color. This is a precautionary measure to ensure the safety of the person getting their hair dyed by detecting any adverse reactions to the chemical components present in the dye. The given time frame allows for sufficient observation of the test area for any signs of redness, itching, burning, or other symptoms of an allergic reaction.