> <i>In theory, the combination of CMY at 100% (100,100,100) creates black, In practice it creates a muddy brown due to limitations of toner (and ink) secondaries.</i><p>Does anyone know why this is?<p>> <i>"K" is used for black to avoid confusion with Blue and because the black component is the "Key" for a set of color separations</i><p>I always assumed it was just because "K" is the last letter in "black" — apparently not!