Major hair color changes and highlights are best left to the professionals. However, anyone who wants to dye her hair at home can use store-bought products to achieve results similar to the color and quality expected from a hairstylist.
When selecting a dye to use at home, look for foolproof options such as Kelly Van Gogh Master Blend Multi-Dimensional Luxury Hair Color or Umberto Beverly Hills U Color, and follow all instructions carefully. Always make sure hair is well moisturized before applying a color, and use professional tools such as a tint brush with short, stiff bristles and a pointed tip.
Longer hair usually requires two boxes of store-bought dye, but a bob haircut is typically fine with just one. The color on the box of a hair dye is just an indicator of the final color, which is always based in part on the color of the hair before dyeing.