This painting was a low key example I painted for my class at the Stutz Art Space. I have them working on a limited palette and wanted to demonstrate how to grey down color without the use of black. When I taught color theory years ago, I used the Munsell theory which is based on color relating to 10 values of white to black. The problem is translating that as many of us choose not to include black with our color choices. The cool or warm greys from mixing complimentary colors were good discoveries by all. Good results, lesson learned.