Review (3/5): Still blue
Well, I used this product twice and my hair is still blue.
I found it easy to mix and a little messy to apply because it's a bit thin. I applied it the first time all over my hair thoroughly, put a shower cap on it, and let it sit for 20 minutes like the box suggests. I rinsed and washed my hair for at least 20 minutes, and it was still blue.
I applied it quite a lot heavier the second time, put the shower cap on and a towel over top, and let it sit for 20 minutes again. I rinsed and washed the same as before and... it's still blue!
My hair is not any different in texture or quality than before, I don't believe it was damaged in any way by this product. It does smell strongly like sulfur, so be prepared for that.
I'm not sure why this didn't work for me, other than that my hair has been blue for many years. I will not be bleaching, as I know for sure that's damaging to hair.