Why does blue black dye wash out?

I'm debating whether I dye my hair black or blue... Or black with blue streaks or blue with black streaks. Any other Ideas ar...

Is there any way I can tint my black hair with blue without having to bleach it? I don't want blue hair I just want it to sho...

I recently dyed my hair midnight black. I followed all the instructions and even used the conditioner in the package. I have ...

I haven't dyed my hair black in about a month and a half it's now a dark brown-ish black. So I was wondering if it was possib...

I want to highlight my dark brown hair with blue but I'm afraid it will start fading away wash after wash because my friend w...

http://funadvice.com/r/15igm7a4gem So im making these,i have the studs and blue and purple dye. My initial plan was to use wh...

I have black hair with chunks of blue in it. But my hair extentions are black. if I was to buy human blond extention would I...

I have very dark black hair (colored) but I want that blue-black look. I don't think I would need to bleach it since I'm real...

I need to have my hair black for a concert coming up and I don't know if I should use 8 washes black hair dye or black hairsp...

My hair is brown and sholder length...and I want to dye part of it blue but I dont want to cut my hair...I was thinking about...