Intermediate Color Scheme

Blood Red Mirror by Gerhard Richter.  While the actual title of the painting give you the impression that the image is a primary color red in fact it is not.  The "red" is actually an intermediate color.  My first impression was that it was a secondary color but the image is darker than red, and violet.  I would place this color as a #3 between red and violet but not actually red-violet. It is very simplistic in form and shows the basics of intermediate color scheme since this color could not be achieved unless there were other colors added.  I would also say that there was tinting added to give the color a deeper, darker shade of red.