I have been told that darkness is better to use than blackness; that blackness is not correct.
But what about this intellectual giant Carl Sagan here (0:52):
http://youtu.be/dj_MZ6i5Dr0?t=52s
He said "blackness" with the stress on that worldword and he certainly is aware of English.
So, my question is: why couldn't I use the word blackness instead of the word darkness if it is more logical (reference to the black color instead of vague dark which can also be dark-brown, dark-red etc.) and Carl Sagan use it too?
I am really curious about that, because when I used word blackness"blackness" on several occasions people smiled at me and told me it is wrong.
Is it OK, to use that word in the academic world and just stay awareaway from it when dealing with a casual people who speak English?