I have tried just about every hair color the drugstores sell, Preference by Loreal does work well to cover grays but I find it too harsh, it tends to dry my hair out...I have a few grays starting to come in I swear by Loreal Natural Instincts the more I use it the better my hair feels and looks and it's very gentle...they have some great varieties of blondes you can't go wrong with Natural Instincts try it I know you'll like it (my hairdresser suggested I try it to eliminate damage from coloring).

Good Luck:)