Hi everyone, I've been colouring my own hair for about 30 years and have no desire or intention to start using a hairdresser for it, but I've found that the home colours I use are not really covering my increasingly prevalent greys. I've used L'Oreal Recital Preference mostly but have also tried L'Oreal Paris Excellence, Garnier Nutrisse, Garnier Olia.
Does anyone have any suggestions for foolproof grey coverage?