Highlight Gray Hair
Q: If someone wanted to highlight gray hair (silver and dark) what would you suggest? She does not want to color her whole head.
However, when an individual with gray in their hair wants to add an additional highlighting color, you follow the same basic principles as for non-gray individuals. You have to find a color that will be complimentary to the existing colors.
Using the still-pigmented hair, you need to find the base color for the natural hair color. Once that is done, you can select a "highlight color" that will compliment that color. For example, if the non-gray hair is a dark auburn brown, then using a light auburn, or dark strawberry blonde would make a good highlight color, adding depth without trying to over-lighten the hair.
If the individual has a lot of gray (more than 50% coverage), you might want to use this technique to "lowlight" the hair and give partial gray coverage. By choosing a complimentary color (based on the natural color of the pigmented hair) you can blend the transition from pigmented to gray and give a more youthful appearance.
How to color hair
How to choose natural-looking highlights
Hair tips for looking younger