You are thinking about it the wrong way.

Let me ask you about this... how does the electroreceptive sense feel to you? It doesn't feel like blackness... but it doesn't feel like anything. Because you haven't experienced it before, you wouldn't have a frame of reference for what you don't feel.

This is the sense I am talking about, btw. It is usually only found in aquatic life.

https://en.wikipedia.org/wiki/Electroreception

While not blind myself, here’s a better way to think about the question you are asking:

What color do you see out of your elbow? Black? Because I don’t see at all out of my elbow

I can't know. I've never seen anything. Even if it were black, I would have nothing to compare it with.

If you were to suddenly go blind, you would think of it as black because you wouldn't be getting input. But no, blind people don't know what black is and all black really is to us is an absence of light.

Also, I think this might help you begin to understand:

https://www.npr.org/sections/health-shots/2014/05/26/314621545/the-blind-woman-who-sees-rain-but-not-her-daughters-smile

It sort of explains a little bit how the brain divides up various kinds of visual input. It still blows my mind, but it is another piece that might help you understand.

this experiment (for sighted people) may help you understand: close one eye, but keep the other open while looking around. what color do you see out of your closed eye? usually, your brain tunes out the signal from it completely since you have the other eye open - you don't see black, white, or anything for that matter out of your closed one. if that worked, now imagine that with both eyes!

If someone only lost one eye but still had the other one, the brain uses the existing eye for vision. You'll lose some stereo vision, but that would be about it.

In some cases, if one eye is good but the other is exceptionally poor (Amblyopia, also called lazy eye), the brain may actually stop paying attention to the poor eye. In some cases, that presents as blackness to that one eye, in other cases, it just results in severely reduced vision. That is why for children, they do the patching... What they are doing is patching the GOOD eye, to force the brain to work with the weaker eye to improve the connection.

It's been equated to seeing out of your elbow. Do you see black? Or does it not register.

I also can't see out of one eye. My entire field of view is out of my right eye, I don't see black on the left or anything like that. It's like taking a picture and cropping it in half (so the entire picture is just the right side). Seeing black would be like drawing a black rectangle over the left side.