When I pose the question, “What is black?” at a teacher training workshop, I inevitably get two standard answers in response… “Black is black… a color,” or “Black is the absence of all color.”  That’s when I like to break out my filter paper and Vis-A-Vis pens and get ready to amaze the audience.  This is one of my favorite experiments to show the scientific principle of chromatography and answer that elusive question… “Is black really black?” Watch the video below, then check out the experiment.