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For a blind person that's never had sight, asking if their lack of sight is "black" is like asking any of us whether our sense of magnetism is black. There is no context, therefore there is no "lack". A "never sighted" blind person can intellectually understand sight and light the same way I can understand magnetism or gamma rays - they can experience radiative heat, and understand that this energy form has a detectable presence to the sighted.
The "once sighted" presumably know that it's black.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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