The Raising of Dyed Fabrics

Patterns of woven wool fabric dyed with various types of dye and of the undyed material are raised together both wet and dry, and the thickness of each raised pattern is measured. The results indicate that in general cloth dyed with Neolan dyes is raised more readily than undyed cloth, but when dyed with acid milling dyes, neutral–dyeing acid dyes, direct cotton dyes, mordant dyos, or indigo the susceptibility of the cloth to raising is reduced. Application of equalising acid dyes produces little change in raising characteristics. While recognising considerable variations among individual dyes from each group, it is significant that, except in the case of indigo dyeing, the lower the final pH. of the dyebath the more easily can dyed fabric be raised. The changes following dyeing are most marked when the cloth is raised wet.