Dollie Dead Face
Depending on the dye it will have a blue tint. I recommend Special Effects brand hair dye it works really well. Don't get Manic Panic it does not work well. I have used both of those and other dyes before and from my experience Special Effects works best.

Jaklyn♥
If you don't want to bleach your hair and it's dark, it might just have a slight hint of blue (will probably only show in sunlight). If you bleach your hair, you should probably tone it if it has a very yellow color afterwards. Blue+Yellow=Green. So if you put blue hair dye on very yellow blonde you're just going to end up with green hair. As for hair dyes, Special Effects, Jerome Russel's Punky Colour are really good. Beyond the Zone and Manic Panic are decent. Color Fiend= Fail!

Becky™
dye it like this :)