What is the main benefit of using a conditioner after hair color treatment?

Using a conditioner after a hair color treatment primarily serves to lock in both color and moisture. When hair is colored, the cuticle layer can become lifted, leading to potential moisture loss and color fading. A conditioner helps to smooth and seal the cuticle, thus retaining the vibrancy of the color and ensuring that the hair remains hydrated. This is particularly important because colored hair tends to be more porous and susceptible to damage.

In contrast, other options like speeding up drying time, changing hair texture, or increasing volume do not specifically relate to the primary purpose of condition after coloring. While those aspects may have their own benefits, they are not the main focus when considering the advantages of using a conditioner post-color treatment. The primary goal is to protect and maintain the integrity of the hair and color.