Dark brunette hair is tricky - salon transitions generally involve some degree of bleaching to remove the dark dye. Depending on the condition of your hair, this could result in damaged, broken hair. Many women with dark brunette dye choose to grow out their gray hair cold turkey, cut out the dye, or use the dye strip technique to disguise their grow-out. Another option is to use wigs and let your gray hair grow out cold turkey underneath a wig. If none of those options appeal to you, and your hair is relatively healthy, find a salon that is experienced in doing gray hair transitions. You can find gray-friendly salons in my directory, and check out this facebook page for inspiration.