I really don't condone self-hair coloring, especially with bright, crazy colors unless you are either a stylist, know what you are doing, or have somebody that knows what they are doing on hand. My mom is a stylist and I know my shit about hair, and I plan on becoming a cosmetologist. While, like I said, I don't condone doing it yourself, I know a lot of people will try to do it themselves anyway and end up with, frankly, a mess so I've compiled a tutorial to help those that want the bright, unnatural hair colors without spending hundreds of dollars at salons.
1. Gather all of your preliminary supplies. I'm using Wellite on-the-scalp powder lightener, a 1-to-1 combination of 20 and 30 volume peroxide, a mixing bowl, a color brush, a rat tail comb, and a butterfly clip.
2. Part your hair according to what parts you are going to color. I'm only doing a chunk of my longer hair, so I'm separating it with the tail of the comb and clipping at away from everything else.
3. Measure out your lightener. If you're using this on the scalp, be sure it's SAFE FOR USE ON THE SCALP. You'll burn your skin if it's not.
4. Mix in your peroxide. I use creme because I think it's less messy than liquid, but it all depends on preference. It's pretty much always one part powder to one part liquid. Use whatever your hair color requires. Light/medium blonds will likely only require twenty to lift to pale yellow/white, light/medium brown will likely require thirty, and dark brown I suggest doing one bleaching using thirty to get it as light as you can, waiting a few days, and bleaching it again with either twenty or thirty as needed. You could use forty volume, but I wouldn't suggest it, especially not on ethnic or fine hair. Thicker hair can probably handle forty, but be especially careful for forty volume peroxide. My hair is dark blonde, so I'm using a mix of twenty and thirty to get about twenty five. It shouldn't be too thick, but it shouldn't be runny either.
5. Prepare your work station. Cover EVERYTHING in towels and get gloves on, or you'll burn your hands.
6. Apply it first to whatever parts of your hair is darkest. I've got roots, so I'm applying it there first. Let it sit until it's lightened about halfway to where you want it.
7. If you've got another section of hair you /don't/ want bleached, cover it in conditioner. This won't allow the bleach to get on it.
8. So one of the pictures in this is just the roots. Don't know why I put that there but w/e. XD Once the darker part of your hair is lightened to halfway where you want it, put bleach over whatever part of your hair has an unnatural color in it already. The hair under the color is still lightened, unnatural colors work more like a stain than a regular hair color. They don't bleach out the same way, and it's unlikely you'll get it out completely with bleach. Color stripper would work much better, I just happened to be out.
9. If it seems to be taking a long time, you can use LOW heat on it to speed up the process. Just keep a bottle of water [or leave-in conditioner, I prefer it just to try to minimize the damage of the bleach] on hand to moisten the bleach if it starts to dry out.
10. Wash out the bleach. Use a gentle shampoo, but don't condition yet. You don't want anything blocking your hair from absorbing the color. This is where things get a little different. If you were using a regular color, you would condition here because the peroxide in regular colors can strip away conditioner with fair ease.
11. Clean out your brush and bowl, or just use a different one, and pour your color into the bowl. I mixed mine with Manic Panic Atomic Turquoise and Electric Banana. It kills me to use Manic Panic, I would much more highly suggest Pravana because it's professional and the colors stay so much better, but MP is what I had available at the moment and I'm impatient. XD
12. Apply your color. If need be, cover it in aluminum foil. I've coated the hair I'm not coloring in conditioner again, so I didn't worry about using foil. Wrap your hair in a towel you don't care about or use a plastic hair cap. I like to leave my color in overnight, just to be sure it's absorbed all the way.
13. Rinse the color out the next morning. I like to skip shampooing and just use a nice, color-safe conditioner. I suggest getting a couple protein and moisture hair treatments from your local beauty supply.
Hope this helps! Oh, also... I shaved off the side of the back of my head too, so that's all highlighter green as well. XD