What can we add to henna so that we can get dark brown color on grey hair?

Can any one help?? I know if we apply henna on grey hair, the outcome is basically reddish-orangish color... I want to know how can i get dark brownish color by applying henna..


Please donot suggest dyes and colors.What can we add to henna so that we can get dark brown color on grey hair?
the only thing you can add is indigo, spices and herbs will make no difference.What can we add to henna so that we can get dark brown color on grey hair?
leave it on for longg














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