The NCS states that there are six elementary color percepts of human vision—which might coincide with the psychological primaries—as proposed by the hypothesis of color opponency: white, black, red, yellow, green, and blue. The last four are also called unique hues.
Sorry Ozzie did not read question properly, pls accept my apologies, my brain is not working properly at moment. Jen is of to hospital again today to see specialist diabetic doctor
Ladymadge. Not sure whether you are aware but you can post all the questions relating to the same quiz on the same thread. No need to do individual ones. It will be easier for you. Not interfering just trying to keep it simple for you. Happy Quizzing.