Part 2 of an International Correspondence Schools textbook on textile dyeing, focused on wool. It covers wool fiber structure and chemistry, acid, neutral, chrome, metalized and vat/indigo dyes, and the methods for applying them. It also treats union (blend) dyeing of wool with cotton, rayon and nylon, dyeing machinery for stock, tops, yarn, felt and piece goods, and special problems such as shade variations and water quality. It ends with examination questions for students.