Those who are born totally blind, see nothing. Not black...just nothing.
Those who go totally blind later, see black as they are familiar with the color. Most people are not totally blind and see a variety if things. Some people have perfect vision for what they can see but it is very little compared to sighted people. It would be like poking a hole in a piece of paper and walking around like that.
Other people it is blurry. It is like looking through wax paper. They can make out shapes and colors but it is not crisp.
Still others can only see thing up close. So everything appears normal to them but they cannot see more than a few inches or a few feet away.