Keratin fibers, particularly wool fibers, constitute an important natural raw material in the textile field due to its comfort and thermal proprieties. Filling a gap in the literature, this book covers all general topics related to the dyeing and printing of wool, wool blends, and other keratin fibers. The text presents the chemistry of relevant dyes, including metal-complex dyes and reactive dyes. It also discusses the physical properties to optimize these processes. This sourcebook provides essential scientific and technical knowledge to both professionals and academia.