I am eternally grateful for this tutorial! After butchering my hair with straight bleach I had essentially decided to just keep it dark, but after getting it lighter than expected with ColourB4 I decided to have a go with a gentle bleach bath to see if it would lift to blonde-ish. I am now a light blonde! And it's in good enough shape I'm even considering another bleach bath (after a lot of conditioning, of course - this girl has learned her lesson!) to see if I can make it to platinum-ish. I also found out that my roots lift from natural light brown to pale yellow with just a bleach bath, which is awesome! That will save both hair health and money. Daenerys-hair here I come.
Does anyone have any idea as to how long I should let it work? My darkest bits are at a gold stage, whereas the rest is yellow-gold and yellow, with light yellow at the roots and some stripes. I want it to get to yellow at least, preferably a pale yellow, but as long as I get rid of the gold bits I'd call it a day if my hair health requires it. As I use a box kit I don't know exactly what strength the peroxide is, but I'm assuming 20 or 30vol as it took my light brown hair to pale yellow when diluted. I know it's individual and all but a pointer would be nice. Last time I bb'd I left it on for fourty minutes for two/three shades of lift, but then I had lots of stubborn orange in it, so it might be overkill when it's this light already.