Some call it salt and pepper but I prefer my hair not to have streaks of white and grey anytime.
Again, this is a hair care treatment that you can make out of your kitchen. Take 100 gms of curd. Add about 1 gm of black pepper to it. Mix it well and apply it evenly on the hair and scalp. Keep it for 60 min and then wash with warm water and mild shampoo. You may do this once a week and witness the remarkable difference.
For more expert advice on greying hair, read
Grey Hair No More by Alexander Miller