Let’s start with the basics. A hair gloss is a professional haircolor service that is offered in a salon. These types of services are often executed by stylists as a way to tone, color-correct or add shine to the hair. As these glosses are a form of demi-permanent haircolor, they are made up of a mix of both oxidative and direct dyes. Combined, this dynamic duo allows you to flirt with a new haircolor without fully committing to it.