Everyone who's into hair knows 'Bleach London' - AKA the salon that create basically every trend to do with fun hair colours, and has done since it's launch. I have watched them with curiosity and intrigue, knowing the next natural progression for them would be releasing their own dyes, and that is exactly what they did...
'Super Cool Colours' are dyes much like those us colourful folk are used to - Directions, SFX etc, although they have a texture more like that of Fudge dyes. The guide for how long the colour lasts is 2 - 10 washes, the pastel shades such as 'Rose' wont last as long as the deeper shades such as 'Out of the Blue'. It's also worth noting that how porous your hair is will effect the longevity of the dye.
Application is super easy - slap it on to clean, towel dried hair, wait 15 minutes and wash it out. I usually leave such dyes on for about an hour, to ensure it's really in there. 'Out of the Blue' is a gorgeous, rich, inky blue with a touch of purple and I love it against my naturally dark hair.
While dyes such as Directions usually give me a solid colour result over faded dye, 'Out of the Blue' did not - it took on a tint of the colour beneath. While this was not an issue for me seeing as the colours below were faded blue and greens, it could be an issue if there was a colour in a different colour family beneath. Keep that in mind to avoid any colour disasters! I feel that these dyes would work best over freshly bleached hair.