From prehistoric times people have been fascinated with color; from cave paintings to the latest computers, color has been a constant companion. Textiles and craft items are made more beautiful by the alteration or application of colorants. This teaching resource investigates dyes obtained from natural sources, such as plants and animals. These dyes still are used extensively by artisans around the world. Background and historic information is given regarding acid or anionic dyes, with emphasis upon their reactions with wool and eggshells. Problem-solving inquiry based activities involve high school level students in answering questions posed about the dyes and their uses. The text is organized in two parts. Part 1, "Teacher Background Information," includes a review of pertinent content, notes, setups for five activities, cross curricular activities to supplement the science-oriented activities, and 14 references. Part 2, "The Classroom Materials," includes student handouts and overheads. (MM)