Final answer:
A color-locking conditioner is used to close the cuticle after a color service to prevent color fading. It contains ingredients like silicones and cationic polymers that form a protective barrier around the hair cuticle.
Step-by-step explanation:
The type of conditioner that closes the cuticle after a color service to prevent the color from fading is called a color-locking conditioner. Color-locking conditioners are specifically formulated with ingredients that help seal the cuticle, keeping the color molecules locked inside the hair shaft.
These conditioners typically contain ingredients like silicones or cationic polymers that form a protective barrier around the hair cuticle, preventing color loss due to fading caused by external factors like UV radiation and washing.
For example, silicones like dimethicone coat the hair shaft, reducing moisture loss and enhancing the longevity of the color. Cationic polymers, on the other hand, have positive charges that bind to the negatively charged hair, creating a protective layer that repels water and maintains the color intensity.