Chemical ServicesQuestion 84 of 100
Which type of haircolor lasts the longest and involves a chemical change within the hair?
a.Temporary color
b.Permanent (oxidation) color
c.A color-enhancing shampoo
d.A leave-in conditioner
Explanation
Permanent color uses an oxidizing developer to deposit color within the cortex, producing a lasting change that grows out rather than washing out. Temporary and semi-permanent colors coat or lightly penetrate and fade with shampooing.
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