Late last year I colored my dreads for the first time: first I bleached the tips, then used a mixture of Phantom green, Blue Jean Baby and a touch of Transilvania. The color faded over the half year, but was still beautiful. (I rarely wash my hair).
This time I opted for a mix of Phantom green (roots) and Aquamarine (more towards the tips). Phantom green covers the natural roots quite well. This second coloring even covered the henna tips (first time no red after 5 years). I used about 2*8oz. I am very satisfied with the product.
The photos show before and after the second coloring