What do you call it when you dye the underneath layers of your hair?

like this:

http://www.wikihow.com/images/f/f1/Blasd...

i want to dye my underneath layer black-blue with bleached tips.

What do you call it when you dye the underneath layers of your hair?

i think that its called peekaboo

What do you call it when you dye the underneath layers of your hair?

oh i've done that before

i didnt kno wat to call it either so i just told the hairdresser i wanted it dyed underneath and she knew wat i meant