Absorbing color and retaining color are two different properties. Damaged hair has greater porosity than undamaged so it absorbs dye more quickly; but just because it takes to color faster, that doesn’t mean it holds it better or longer.
Healthy hair holds color longer than damaged hair. When the hair shaft is hydrated and conditioned, both before and after coloring, it will lock in moisture and seal in the color, giving you better results.
If your hair is stressed and over-processed, it will benefit from ammonia-free products, especially if you’re looking to maintain your natural color or go darker. (You can’t go lighter with ammonia-free formula.)
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