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I have naturally salt and pepper hair which I've been dyeing crazy colours for the last year. The latest colour (teal) is proving an absolute bugger to shift and even after using 2 boxes of Colour B4 I'm left with dull muddy looking greeny-blue grey hair (hawt). Pretty sure all the dyes (despite being semi permanent) have stained the cuticles.
I was thinking of doing a very gentle bleach bath, ideally it would leave my hair nice and light so I can dye it the colour I want to commit to on a long term basis (light purple).
My only experience of bleach bathing was not a good one!! Was years ago at a hairdressers in order to go from blonde back to dark (she said they needed to get the ash out otherwise it would go green). My hair was wrecked for ages afterwards...I could rub the ends with my fingers and it would just sort of disintegrate . I wouldn't recommend based on my experience but others may say different!
If you've tried everything else to shift the colour then yes I would bleach bath. I would also slather the hair in a good coat of coconut oil before you bleach. It won't slow down the bleaching process but will give a layer of protection to the condition of you hair and your scalp. Also, bleach works quicker in warmer conditions so do it in a warm room and cover with a shower cap or plastic bag to trap some heat. The less time its on your hair the the less damage it can do.
I'm planning on using the very gentlest peroxide available with loads of shampoo and constantly checking the colour so that I can rinse immediately. As the alternative is being stuck with this horrible patchy colour (and bonus grey roots ) I think I might go for it. Damn my impulsive nature. Will report back if I do.
I have/had green hair too.....from Directions Plum after it had faded (on previously bleached hair). I have done two lots of Colour B4 which left my hair in an awful condition, so I am just growing the green out now. I don't dare bleach t again. It has been green for about a year!
I have found that Directions Cerise/Dark Tulip/Rubine/Violet all cover the green easily with no bleaching required. They also cover my greys quite well.