Nothing is seen as black because humans cannot conceive what nothing truly is, so we picture it as what we would imagine it to be.
What do you picture it as? blackness? White? Well that's something.
We see nothing as black, not picture it that way.You see (almost) nothing every time you look in the black space between stars.
The visible spectrum is a very, very small band of frequencies. We make assumptions based on what we know, that's sort of what serious astrophysics and particle physics is; a bunch of assumptions based on other assumptions.
You see (almost) nothing
The problem is that nothing is completely theoretical, you can never truly achieve it.Which is basically what my original statement was trying to tell you.
I really don't know how I can make this any easier for you to understand.
Its hard to argue with children now a days.as Night Fox said"Nothing refers to something""That something being Nothing"Something == Nothing :: but then :: Nothing =/= Something?