RAINBOW HAIR

its probably best to stick to one brand. I'd recommend directions or crazy colour for this, as they're cheap and easy to apply.

Probably the best way to do it is pick out which sections you want which colour (the yellow section will need to be bigger as its easily bled into) before you go to dye. Tie them up in a band. One section at a time, apply the dye and find a way to keep it seperate from the rest of the hair. If you can use foil, or tie it back up, do that. If not, stick a hair dryer on it (not ideal - the colours don't last as long if they dry out?).

Wash out with the coldest water you can one section at a time, strongest colours first is best (pink, red, orange, purple, blue, green yellow). Pink isn't really part of a rainbow though 😉

Sulphate free shampoo and colour protect conditioner will be must for rainbow hair!

Also, if you stick to one brand you can mix colours much easier. E.g. directions fire and flourescent glow will make orange, and atlantic blue & fluorescent glow will make green. 

I pretty much agree with everything VaLukeAraptor said. I'd go for directions personally as I know they last on my hair a lot longer than other brands.
As for colours. here is what I personally would go for. [:

Pink - Flamingo Pink (usually I use rose red but it's a bitch for staining so probably not wise)
Orange - Mandarin looks really bright over bleach
Yellow - Fluorescent Glow
Green - Spring green
Blue - Lagoon Blue mixed with a wee bit of Atlantic Blue
Purple - Violet
Red - Fire

For pics you can see some here Rainbow Hair Photos - it needs a little clean out as a few of the photos, although bright and colourful, are not technically rainbow's but most of the photos in that section give a good idea about rainbow designs and looks.  Hope it helps.

ADDED - I have had a tidy up of the rainbow section on the gallery so it should be more or less rainbow photos only in there now.  There are a couple of bright/mixerd photos that are not 100% rainbows but are very close so I have left them in there.

Ive tried to do the whole rainbow thing twice now. Granted its only my fringe part that I coloured, but its still a crazy effort to get it going 🙂

I found that using different colours from different brands makes no difference. Ive had no problems with colours blending into eachother whilest rinsing them out or washing it at later stages.
I used tin foil to seperate each colour with no problem other than having a fight with my reflection lol

The best colours with staying power that ive used are Manic Panic ---> Electric Banana & Special Effects ---> Napalm. Those 2 colours just won't come out! The darker colours like blue or purple dont bleed into the yellow at all, so far every colour has been stuck to their own little section.

After letting hte dyes set i took out all the foil and just rinsed it all in 1 go under cold water.
I dont know if that made a difference to avoid bleeding as i only did it as hot water didnt feel quite nice on my freshly bleached hair lol

Here is a thread with pictures of my 2 rainbows witht he colours ive used: http://www.hairdyeforum.com/index.php?topic=325.new;topicseen

I'd say keep it simple. Choose 5 colours and run with it.

Thanks for your advice! My hair is alll bleached! I bleached it from green and it went an almost white instantly...so the colours will work very well on it... just gota wait for money then figure out what dyes to use then the Beeunique will get lots of money from me 😀

Done

That looks amazing! I'll bet you are very pleased with the results as its a brilliant rainbow effect.  Please let me know if we can add it to the hair dye gallery if as we keep the gallery and forum separate and never add pics to the gallery without permission so wont include it if you don't say we can.

PS - your avatar photo is not showing up - if there's any prob pm me the pic or link and I can add it to your profile at this end 🙂

Yeah i added it to the beeunique site not sure its uploaded yet, i sent like 8 picks off the old hair colours i had but they didnt get uploaded for some reason.  But yes of course you can add it 🙂

I am in love with the colours!

Can you pm me your email address and i'll check what happened there.  We get so many emails with photos it may have been missed but I can take a look and let you know.

UPDATE - I have checked your email address and we have those pics ready to be uploaded with the next gallery update.  We do it the start of each month and your pics arrived the day after the last update so are on the list for the July update.

That looks fantastic! What dyes did you end up using?

I did want to only use special effects dye because its the best i find but its also the most expensive. So I used Napalm orange-special effects because it was the most gorgeous orange dye. I used Directions Spring green and Plum which is very pretty. I used Manic Panic Electric Banana and Vampire Red, both are lovely bright colours...and finally Sky blue crazy colour...Sky Blue wasn't my first choice but the price was getting expensive...still a nice colour 😀

x

They all look really good! I'm actually really impressed, I've never seen hair dye done like that before.

aww thanks xx

Wow- I am in awe! I had enough trouble trying to put in one thick streak of colour whilst dyeing the rest all one colour, I think if I tried what you did it would be an absolute disaster.  It looks amazing.