How Hair Color Works
Hair color comes from melanin, produced in hair follicles during growth. Melanin exists in two forms: eumelanin (brown to black pigment) and pheomelanin (red to yellow pigment).
Permanent color uses ammonia to open the cuticle and peroxide to lighten natural pigment, then deposits new color. This creates lasting change but involves chemical alteration.
Semi-permanent color coats the hair surface with pigment without penetrating the cortex. It gradually fades with each wash and doesn't lighten natural color.
Demi-permanent color slightly opens the cuticle, allowing partial penetration. It's gentler than permanent color and lasts longer than semi-permanent.
Lightening and Bleach
Bleach removes pigment through oxidation. The longer bleach processes, the lighter hair becomes, but excessive bleaching damages the hair structure irreversibly.
Darker hair requires longer processing and potentially multiple sessions to achieve lighter shades. Each bleaching session causes cumulative damage.
Color Care Protocol
- Wait 48-72 hours after coloring before shampooing
- Use color-safe shampoo and conditioner formulated to seal the cuticle
- Use sulfate-free products to prevent color fading
- Apply deep conditioning treatments weekly
- Minimize heat styling and sun exposure, both of which fade color
- Schedule touch-ups every 4-6 weeks for permanent color
Purple and Toning Shampoos
These specialized products neutralize unwanted tones:
- Purple shampoo eliminates brassy tones in blonde or silver hair
- Blue shampoo neutralizes orange tones in brunette hair
- Toning shampoos extend color vibrancy between professional treatments
When to See a Professional
For dramatic color changes, bleaching, or color corrections, consult a professional colorist. DIY mistakes can be costly to repair and cause significant hair damage.