More ideas from Lara
In order for gray dye to look true to its color, it should be applied to hair that has a white-silver undertone, which is exactly what you'll get when you put purple toner on bleached hair with a yellow undertone.

You got the really beautiful steel blue muted color when you put blue over orange which gave you that rich dark blue green color. And then you put Violet with a bit of blue black over that teal color. Then you got beautiful navy blue.