Hair Treatment Composition, Kit and Method Thereof

A hair treatment composition, particularly a hair colouring and/or bleaching composition, comprising one or more oxidizing agent(s), one or more alkalizing agent(s) selected from the group consisting of ammonia, its salts and mixtures thereof, one or more fatty alcohol(s), one or more non-ionic surfactant(s) and a low amount of specific fatty compound(s). It is also provided a kit and method thereof. Superior hair treatment performance, particularly superior colouring and bleaching performance, with a reduced or an eliminated smell of said alkalizing agent(s) upon application, is achieved.