In order to get your colors true you’ll need to get your hair as light as possible. Don’t assume this is impossible if you have naturally dark hair; my hair is nearly black and I manage to get my roots almost snow white without toner on my first bleach session.
I recommend L’Oreal Feria Bleach Blonding if you have thick or long hair because it gives you a good amount of bleach, but if your hair is shorter the Manic Panic Flash Lightening kit works just as well. I use the Feria because my hair is very thick.
Unfortunately I wasn’t able to bleach out all the pink, but the majority of it is in the under layers and in the back so it will be covered by the darker colors and shouldn’t effect too much. The only place I may see it is in the ends of the yellow but it still shouldn’t be too noticeable.
One of the hardest parts of dying the rainbow is sectioning the hair. Start on one side of your head and just use the pointy end of the dying brush to part each section in a straight even line, then wrap that section in a hair tie. Once you’ve got one half sectioned evenly, doing the rest is much easier because you can just match the sections up at the part so they’re equal on both sides.
The colors I used were Special Effects: Cherry Bomb, Napalm Orange, Limelight, Electric Blue, and Deep Purple; Manic Panic: Atomic Turquoise, and Electric Banana; Color Fiend: Turquoise Tsumami. I mixed the three different blues together, despite them being different brands. I don’t suggest doing this unless you have a bit of experience or are willing to take some risks.
Now that you’ve got your hair sectioned, untie just the front section for red and apply your dye, then wrap it up in some tin foil to keep the color from touching any other sections. Do this again for each color, just be cautious not to lay your hair over other sections and make sure it stays secure in the foil to avoid any mistakes. Let sit for as long as your dye instructs. I use and recommend Special Effects, a vegetable dye, so I let dye sit on my hair for a few hours to get the most out of it as possible.
Be extra cautious when rinsing! This is the part that could totally mess up the rainbow because the dye tends to bleed a lot and may bleed into each other if you’re not careful. This is a good time to get a friend to help you out if you haven’t already.
In the sink rinse out each other separately not allowing them to touch at all, especially with the yellow. It may also help to tie off the sections again after rinsing them. I say to do this in the sink because if you were to try to rinse it all together in the shower you’d end up with a mess of bleeding colors. Good luck and happy dyeing!
This is a delicate, true turquoise colour (like the gemstone), from Manic Panic. It is extremely eye-catching and a much softer shade than most other turquoise hair colours. It's essential ... - More details
This is a semi-permanent ruby red hair dye from Special Effects. A rich jewel-toned red with light pink reflexes. - More details
An extremely rich deep purple hair dye by Special Effects. This is a semi-permanent colour but often lasts several months on bleached hair. The shade is almost purple-black at first ... - More details
Ever wanted really, really bright hair colour? Try Manic Panic's Electric Banana! Applied on its own to light blonde hair, it's a super bright day-glo yellow and glows under UV. ... - More details
Electric Blue is a really vivid semi-permanent hair dye from Special Effects with a good depth. It starts out very dark blue which looks almost neon in sunlight and gradually ... - More details
Lime Green is a unique green hair colour. It is a brilliant rich green semi-permanent from Crazy Color which has a tiny hint of blue to give it depth. - More details
Want a bright orange? Try Napalm Orange but prepare for something eye-poppingly bright! It's a fantastic red-orange semi-permanent colour from Special Effects that also glows under black light. Check out ... - More details
Nuclear red is a semi-permanent hair dye from Special Effects. This colour is a really bright neon red with the slightest orange tones. - More details