[146] Scholars have studied the medieval and early modern processing, ameloriatons and dyeing techniques for woad in detail, and analysed the chemical processes involved. Literatrue on this matter is expansive. Detailed technical descriptions based on historical sources and scientific analyses, partly based on reconstruction research, can be found in the above cited literature. The most comprehensive study of medieval woad production and trade, and much cited in later studies, is  still Jamieson B. Hurry, The Woad Plant and Its Dye, published in 1933.