Ammonia free hair colour is an increasingly popular choice for those looking for a lower impact hair dye. However, it does not come without its disadvantages; it is often less effective than ammonia based colours and can be more expensive. Furthermore, it can cause irritation to the scalp, as well as result in dry and brittle hair due to its lack of conditioning properties. Additionally, some ammonia free dyes can result in more fading than traditional dyes, leaving hair looking dull. Finally, it is important to be aware of potential allergic reactions as some of the ingredients in ammonia free hair colour can trigger a reaction.