There is no way, but doing multiple applications, which means you'd constantly be upping roots, and intensifying by doing it again a week later. There is no concoction that makes it darker as of the get-go. And be careful with straight up indigo on grays (might be same as on bleach and light blonde hair, might need a red "filler" first).
I would not recommend a natural dye for people going gray. Nope. Just nope.
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