Not darker henna, necessarily; if anything, you should mix it up yourself instead of buying something premade to try to darken it. Look up some recipies that are a mix of henna and indigo, maybe? Indigo darkens the hair, so you can achieve a nice brown shade by mixing a little of it in with your henna. Straight-up indigo would just be black, I believe, so it needs to be mixed with henna to create brown.
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