A client has previously been color-treated to a level 8 warm blonde and now wants to return to her natural level 5 cool brown in one appointment. The safest color-correction strategy is to:
Explanation
Going darker on previously lightened hair requires REPLACING the underlying warm pigment that bleaching removed; without it the deposit looks ashy, dull, and 'green' because the hair lacks its red-orange contributing pigment. The professional correction is to pre-pigment (fill) with a warm gold/orange filler matched to the natural underlying tone at level 5 to 6, then immediately follow with a deposit-only level 5 cool-brown formula at 10 volume. Option A skips the fill and produces a muddy green-grey result. Option C uses a lifting formula when no lift is needed and ruins integrity. Option D substitutes an unknown drugstore formula for color theory. California licensees perform oxidative color under CCR Title 16 §979.4 and must understand contributing pigment to deliver predictable color.
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