There is a great variety of hair dyes, adapted to different hair needs and styles. Here are the four most popular types so that you can compare them and choose the most suitable one for you.
Permanent. These dyes are the most effective, but also the most invasive for the hair, as they contain ammonia. They are the best at covering stubborn grey hair, and the most suitable for radical colour changes; they also come in a wide range of shades.
Semi-permanent. Also known as "tone-on-tone", these dyes are not as aggressive as permanent dyes, as they do not contain ammonia. They are ideal for beginners with little grey hair, but are not recommended for very platinum hair, as they do not have much covering power.
Vegetable. Vegetable hair dye is the most natural option of all, as it does not contain ammonia or any other oxidants; it also adds shine and volume to the hair, although it tends to darken it. It is recommended if you want to change the tone, but it hardly covers grey hair and lasts only a few washes.
Fancy. This type of hair dye requires prior bleaching that is mainly done on the highlights and lasts between 1 and 2 weeks, depending on the number of washes. It is usually done in unconventional shades such as blue, pink, purple or fuchsia, for example.