I have naturally grey hair ( 60 yo), but have coloured it for years (dark brown) I did have dark brown hair naturally. New grey root growth is visable after 2- 3 weeks so I am often using a root touch up colour. So roots are grey but ends are dark. My question is I really want to go to a light brown as it the grey will not be so visable- do I buy an all over dye? Will it give equal coverage? Or will it appear uneven ? Salon is not an option atm unfortunately. Advice appteciated.