Concerned about dying hair.... ?

I use splat pink fetish and if you want the most vibrant color you have to dye it till its almost white. First since its your first time it shouldn't take long. Leave it in for an hour and check on it. If its still a little brown keep it on for an additional hour or so. The first time I did it the color was this yellowish tone. You can put the color in or you can rebleach it again a couple days later until you reach the lightness you want. Then what I do for the color is leave it in overnight. Put the color on dry hair and be careful with the blue because it stains really bad. Lol. The blue lasts for a long time even if you wash your hair all the time. Just be sure to wash in cold water. Since your hair is kinda dark it may take a while for the bleach to work. My hair is white under the pink so when it begins to fade it looks lightish pink with white streaks. :)