Black? Maybe dark gray? If so, the color is called "Graphite," and you've posted in the wrong forum.
You may want to try posting in the
iBook (colors) Forum.
You have posted in the iBook G3 (Dual USB) Forum (the one for the first all-white iBooks). They first came out in 2001, so if the one you have is older than that, it's one of the colored models.