Alright I've been googling but to no avail. I can't seem to find any techniques. So ill try you guys. What I want is hair that will shine blue and have dark blue highlights. Essentially making people question whether they are seeing things or not. The reason I want it like this is because if I get a job the hair won't be obvious and my hair is currently black. So my question is how does one archive such a thing? Would you dye the whole hair blue for a short while? Or would you just dye the tips or something?
Edit: I just want it to look black but blue. I don't want the blue to be noticeable.