Which term refers to the development of haircolor products with no ammonia?

• A. Henna-based color
• B. Ammonia-containing color
• C. Ammonia-free haircolor
• D. Semi-permanent color

Answer: (C)

The main idea is recognizing labeling for haircolor formulas that do not use ammonia. Ammonia is the ingredient traditionally used to open the hair cuticle so color can penetrate; in products without ammonia, a different, milder alkaline agent is used to achieve color lift with less odor and irritation. The term that labels this approach is ammonia-free haircolor, which clearly communicates that no ammonia is in the formula. The other options don’t serve as the terminology for no-ammonia development: henna-based color refers to plant-derived dyes, not specifically to ammonia content; ammonia-containing color, by definition, includes ammonia; semi-permanent color describes a type of color system rather than a claim about ammonia presence.