BerinaSilver Ash Grey Permanent Hair Color Cream

natural salt & pepper, want more salt, wondering do I streak my hair with this. or lighten with bleach then put this on?

how long to leave product in hair?

My hair is naturally blonde ash brown (more ash) If I use this on my hair would it help bring out the ash more rather than a full grey?

Will this grey color cover light brown hair color and make it Grey?