Renowned Los Angeles colorist Jack Martin is strongly convinced that noble gray will never go out of style. To help women accept aging naturally he developed a special technique, which allows his clients to feel natural and ideally to give up dyeing their hair at all.
His technique is as follows: first, a special compound removes any remaining artificial color on the hair or the remnants of the previous dyeing.
Then Martin bleaches the hair, while preserving the gray roots, and then matches the new color to the color of the hair roots and creates a beautiful gray throughout the length.
The point is to get used to graying and, when it becomes unavoidable, abandon coloring in favor of natural beauty.
Source: bigpicture
This might also interest you:
Beautiful before and after: How a girl who haven't washed her hair for a month looks