black is the one shade that doesn't require a filler. do not use a henna or like product if you plan on or think you may wish to change the color of your hair because henna can not be stripped, so until it grows out you are stuck with it. if its not henna, normally a stylist can evenly strip it for you.
now here are some questions to ask your self: will it go well with my skin tone? if you are even close to pale, you'll want to consider a warmer dark brown instead. (but you should seek a stylist to help with that)
are you just looking to cover the red? a styist can do this and even out your color for close to the same price as an all over color.
are you committed to the upkeep? black is light blond and requires root touch ups. and lighter roots are WAY more unattractive than darker ones.
do you like definition in your hair? the darker your hair the more it hides, like layers will tend to look less defined.
at 12:00 AM on Feb. 27, 2011