What is a key benefit of using a demi-permanent color?

Using a demi-permanent color is advantageous because it deposits color without lifting the natural hair color. This means it can enhance or change the tone of the hair while maintaining its original depth. Demi-permanent formulations typically contain low levels of ammonia or are ammonia-free, allowing for a gentler application that won't lighten the hair. This makes them ideal for customers looking for a subtle change or to cover gray hair without the commitment associated with permanent dye.

The other options do not accurately reflect the characteristics of demi-permanent color. For instance, demi-permanent colors do not significantly lighten hair; they are designed to enhance or darken existing color. They also do not create a dramatic change compared to permanent colors, which can lift and deposit simultaneously. Additionally, demi-permanent colors do require a developer, though typically a low-volume developer, to assist in opening the hair cuticle for color absorption.