Review (4/5): longest lasting pink you can get
This stuff is called "atomic" for a reason - it will Not leave your hair. This isn't the first time I've used this specific dye, and I know from experience that getting rid of it takes a lot of bleach, and a lot of patience. However, if you're not someone who likes to change your hair color often, I cannot recommend this stuff highly enough. It's the longest lasting dye on the market, I swear. If you don't mind roots, you can easily go months and months without redyeing. (I usually touch it up every 3 months, but that's just because of my roots. The color doesn't budge.) I've gone swimming in chlorine pools and the ocean, spent days under the midsummer sun, used really nasty hair spray, and washed my hair easily several dozen times without seeing it so much as lighten a little.
The only negative, and this I've only noticed this most recent dye job, is that it tends to never stop bleeding. My pillow, phone, nails - they all are still turning pink, nearly 2 months after I dyed my hair. I only wash my hair 1x/week, so if you wash more frequently you might see a sooner stop to the bleeding.
Note: my hair is curly, and very porous. Naturally dark brown, so I bleach before dyeing. I wash my hair 1x/week, and do not heat style. I use only silicone/sulfate free hair products