Dee at Bella does it using a process with a fancy name that I can't quite remember that sounds similiar to chromatrics. It's not highlights, lowlights or dye jobs or whatever else everybody has come up with.
I'm not a hair stylist. That's why I said you need to talk to her. I'm sure it depends on what you want and what can be done. Basically your dark brown hair with grey will become light brown with grey streaks and you may need it done more than once before the grey takes over and the light brown washes out gradually. Depends on how your hair grows. Or you may decide you don't like your grey at all before your next appointment. I have a halo of grey. I thought I'd look cool but I didn't.
I looked like I was going to die any day. That may be true I but I didn't like staring death in the face.