A 1929 article on Immunized Cotton, a chemically treated cotton introduced in Europe in 1924 and in the United States about 1927. It explains the chemistry of esterifying cotton cellulose with sulphonic chlorides (especially p-toluene sulphonic chloride), which makes the fiber resist direct cotton dyes while keeping an affinity for basic dyes. It describes the changes to the fiber, the dyeing and resist-printing possibilities for two-color and white effects, and uses in hosiery, dress goods, menswear and draperies.