Steel Gray Hair Color
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A: The problem with attempting to color hair that is predominantly gray (unpigmented) is that the color that is applied tends to result in a flat-looking color.
In order to get the steel gray hair look you want, you would need to be able to isolate and color random strands throughout the hair. In cases where the steel gray occurs naturally, it is because the gray hairs are evenly distributed among the pigmented hairs.
Your best bet will be to consult a professional colorist about your options. It is possible that he or she can recommend some color applications to give you a natural, non-white, look.
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See also:
How to color hair
Are there different shades of gray hair?
How do I make my hair Santa white?
Is it possible to lowlight silver gray hair with steel gray for a darker gray result?