1) Achromatic color 2) Achromatic colour 3) Black 4) Chiaroscuro 5) Color 6) Dark color 7) Darkness 8) Lividity 9) Negritude 10) Swartliness 11) Tone Found on https://www.crosswordclues.com/clue/blackness
Black'ness noun The quality or state of being black; black color; atrociousness or enormity in wickedness. « They're darker now than blackness . Donne. » Found on http://www.encyclo.co.uk/webster/B/61