Color theory is the aspect of physics that can explain the colors on your computer screen or in your printer. Visible light can be split into different wavelength regions that are called colors. The color of an object is usually the color that the surface of that object is reflecting when white light shines on it. Some of the white light is absorbed and some is reflected or scattered from the surface which usually determines what color we see. In this chapter, students will study the formation and sensation of colors. They will also learn about filters, primary colors, complementary colors, and adding and subtracting colors. Teacher background information, assessment, safety notes, references, additional resources, and a keyword glossary are provided. This book selection also includes the Table of Contents, Preface, Acknowledgments, About the Authors, An Introduction to Phenomenon-based Learning, Appendix, Credits, and Index.