Natural Brown is suitable for dark blonde to medium  brown hair and can be used on grey hair up to 30% grey hair. The result is a stunning shiny brown colour and for 30% grey hair the colour will be a lovely lighter brown colour. Natural Brown is not suitable for brown Hair with over 30% white hair . The reason is that the white/grey hair will go too golden.
Result on up to 30%grey and on natural hair is  beautiful brown shiny hair.