Hmmnnn that's a bit tricky. I've always found rosemary infusions darken, i think a paste of the leaves might be a bit strong to be honest.
You could make some macerated oil though.....not sure how darkening it is but if you use an edible oil to make it you could use it in cooking if it does darken your hair. The good thing is, if it does darken then once you stop using it the stain gradually wears off.
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