With color, what you see isn’t always what you get. Discover the reasons in “Hidden Colors Revealed” when UWM chemist Alan Schwabacher shows various ways that color can be present, but not visible — or uncovered. He’ll make a white cloth made of fiberglass invisible before your very eyes by submerging the cloth in a liquid of the same index of refraction. He’ll demonstrate how substances can change from one color to another by removal of “obscuring” colors. On the flip side, Schwabacher will show some ways that colors caused by chemical reactions can form, and how other colors can hide by being mixed with still other colors. Finally, although colors like ultraviolet and infrared are invisible, we’ll learn how they impact the visible world: ultraviolet and sunburn; infrared and the effectiveness of insulation.
The science of color — some of its rules, its mysteries and surprises, its collusion with the human eye — comes under scrutiny in “The Pointillist Painter, the Sunday Comics, and Color TV: Color Mixing in Art Technology.” In this wide-ranging and engaging program physicist Robert Greenler looks at “a dozen ways of mixing color,” using both the basics we learn in kindergarten for the mixing of pigments and those which govern the mixing of light.
Robert Greenler — What do we mean when we say that a geranium is red, an orange is orange or white white? When, in fact, and why is white white, and what is color? Answers to these and other intriguing questions about the nature of light, the color of common objects, and the way in which the human eye perceives color can be found in this program.