It depends how dark your hair is, and how vibrant you want the colours. I have naturally dark brown hair which I've been dying black for years, and red Henna showed up as a nice tint over the black, and where my natural colour had grown out turned a deep burgundy colour, which I rather liked.
For the black I use Indigo - the blue-black cousin of Henna - and it's been far more effective and healthy than other black dyes. It's also way cheaper than anything else I've found.
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