So, I went into this knowing a fair bit about doing my own hair color and using Overtone. I'm a medium ash brown with a lot of spindly greys, and even though I've bleached my hair and used Overtone before, I wanted to keep my hair as healthy as possible, as it's the longest it's been in years.
So, I bleached a few streaks to hopefully bring out the blue even more, then dumped the color on my entire head. The result? A gorgeous blue-black all over my head, with vibrant blue streaks peeking through! It even (temporarily) covers my greys and turns them bright blue. Honestly, it's my favorite color I've had in ages.
If you're a medium brown or lighter, this color is gonna SHOW UP, honey. Even where my blonde was oxidized and it turns a little green, a quick touch up on the bleached parts keeps it pretty damn blue!
Love, love, love.