Blacknes or Blackness: How To spell?
The word Blacknes is misspelled against Blackness, a noun meaning "The quality or state of being black; black color; atrociousness or enormity in wickedness."
Blackness has double 'ss' in the end mispronounced as 's'Remember double 'SS' appears in the end of this word which should not be misspelled with single 'S'
Wrong Spelling:  blackne-s  Correct Spelling:  blackne-ss 
Explore spell check of Blackness to spell without errors.