"Tie-dyeing is like giving birth," says Duan Yinkai, Bai Tie-dye Master. "You never know what your baby will look like when it's in your belly." Woad root is at the heart of the process. The Bai people extract a pigment from it for dyeing. They have a unique approach involving eight steps in total. Tying and dyeing are, not surprisingly, the most important.