Excellent question @el-nailul, I am also confused about this and still struggle with addressing ignorance in my daily life.
There are three types of taints, the taint of sensuality, the taint of becoming and the taint of ignorance. And an extra taint added from a later text from the Abhidhamma called the taint of views.
The base for all the taints is ignorance when ignorance arises there is the arising of the taints. A good friend of the Buddha, Sariputta said this in the Nibbedhika sutta.
I hope this clears up the confusing, but since I am confused as well, I hope my confusion isn't contagious...hahaha
This getting a bit clearer for me, but this article will remain in my thought until I can figure it myself. I think the ignorance itself is a taint, because that is the process to free the soul from desire on something. it may be wrong, though...:D