Touch of Grey gets rid of some grey but not all. This formula uses oxygen in the air to reduce grey without getting rid of it completely. Preserves hair's subtle variations. No mixing and no messy application. Easy as combing your hair. Leave for 5 minutes. Reduces the amount of grey with each application. The change is subtle and even with repeated applications it will not get rid of all the grey. Contains no ammonia and no peroxide. Permanent hair colour;lasts until the grey grows back.