Dyeing and Printing by Solvent‐assisted Processes

The background to solvent‐assisted methods of dyeing and printing and the uses that have been found for them in practical processes in the U.K. are summarised, with particular reference to the Irga‐solvent method. In principle, the addition of a suitable solvent has the same effect as either dyeing at a higher temperature for the same time or dyeing or steaming at the same temperature for a much longer time. Wherever it is more practical to include a solvent in the dye‐liquor or printing paste rather than increase the dyeing temperature or prolong the dyeing or steaming time, then solvent‐assisted processes should be of interest.