All the brands of rainbow hair dye listed here are semi-permanent and must NEVER be mixed with hydrogen peroxide developer. Simply use as it comes. (Like paint!)
These dyes can last anything thing from 1-8 weeks, depending on how often you shampoo, the brand you use and how porous/absorbent your hair is. (The more porous the hair, the more
vibrant and longer-lasting the color will be.)
To find out the best brands to use, how to pre-bleach safely, the best way to maintain colours, how to separate colours and lots, lots more check out:
'ANY COLOUR OF THE RAINBOW The Ultimate Guide to Alternative Hair Colour!' By Anya Goy, Vidal Sassoon trained hair stylist.
The prices here are based on the best price I could find online and are in $USD. Click on the brand names listed below to see their dye products and colour shades...
NOTE: All the brands listed are available for online purchase in the USA only.
$6.29 Beyond The Zone Color Jamz.