The answer is color oil lighteners. Milady describes two types of oil lighteners specifically: "Color oil lighteners add temporary color as they lighten... Neutral oil lighteners remove pigment without adding color tone."
Powder lighteners are an entirely different lightener form — a separate category covered elsewhere in the same chapter, with no mention of adding temporary color. The confusion isn't really about a close call between two similar answers; it's a case of the wrong lightener category being marked correct.
Why this trips people up: this was one of 12 confirmed answer-key errors found in FadeJunkie's own question bank during a full 300-question textbook audit in July 2026 — corrected and re-verified against a direct quote rather than left as a guess.
Milady Standard Barbering, 6th ed., Ch. 18, p. 658: "There are two types of oil lighteners: Color oil lighteners add temporary color as they lighten... Neutral oil lighteners remove pigment without adding color tone..."
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