Dark quality, lacking clarity, with little or no light to allow you to see clearly. In a broad sense, it also applies to knowledge and ideas that are difficult to understand, to murky or evil feelings, to data that are not obvious.
Darkness: extrinsic phenomenon that affects the sense of sight, producing a dark reflection in the brain. Technology allows to break the darkness light elements that reflect photons on the opaque bodies to develop, releasing the brain of the dark feeling. Darkness consists of the brain sensations to the impression of darkness extrínceca.