Direct dyes used in temporary colors coat which part of the hair?

Direct dyes used in temporary colors coat which part of the hair?

• A. The surface of the cuticle
• B. The cortex
• C. The medulla
• D. The interior

Answer: (A)

Direct dyes in temporary colors work by coating the outer surface of the hair. The cuticle is the thin, scale-like outer layer that shields the hair, and these dye molecules are typically large and stay on that surface rather than penetrating inward. Because they don’t penetrate the cortex (where pigment is located) or the central medulla, the color sits on the cuticle and washes out with shampoo, giving a temporary result. The cortex and medulla are internal structures that aren’t the deposition site for these dyes.

Direct dyes in temporary colors work by coating the outer surface of the hair. The cuticle is the thin, scale-like outer layer that shields the hair, and these dye molecules are typically large and stay on that surface rather than penetrating inward. Because they don’t penetrate the cortex (where pigment is located) or the central medulla, the color sits on the cuticle and washes out with shampoo, giving a temporary result. The cortex and medulla are internal structures that aren’t the deposition site for these dyes.