What is the risk of overlapping color on previously lightened hair?

• A. Fades evenly with no issues.
• B. Improves color uniformity with no risk.
• C. Overprocessing, damage, and uneven color results.
• D. No effect on hair health.

Answer: (C)

Overlapping color on hair that’s already been lightened carries a high risk of overprocessing. Bleaching opens the cuticle and removes pigment, leaving the cortex damaged and highly porous. When another chemical color is applied to those lightened sections, the hair is more prone to further chemical reactions, which can lift pigment more than intended and deposit too much color. The result is damaged, dry or weakened hair and color that looks uneven or blotchy because different areas absorb pigment differently through the porous, compromised cuticle. To avoid this, color only on regrowth, use glaze or toner for lightened hair, and choose deposit-only formulas with lower developer strength, along with strand testing.