Why does my hair look blue to some people when I was born with black hair

I wanna die my hair a type of black , and the type I really like is blue black , the one that turns blue in the sun , Do you ...

Well im kind of dark skinned. If I dyed my hair black with blue streaks under, would it make me look darker?

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...

what color should I dye parts of my hair what colors will look good <RANDOMNESS XP>

I've had my hair black and red before but I dont think it looked really good. But I want to do it again. But I want it to loo...

I have blonde hair with blue eyes. I was wondering would a blue strip under the top layer on my left side look good? Or if no...

I just died my hair a very dark brown.. almost black! I want a cute hairstyle that will make me look... cute! I have Medium l...

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...

I have black hair and plan to highlight it blue or red. But how dark/light of blue or red should I get?

How can my hair look like this? I don't know how to make it look like this?