Accessibility of man-made cellulosic fibres. Part 2: Examination of the exhaustion profiles of a series of reactive dyes on never-dried and dried lyocell, viscose and modal fibres in the presence of varying electrolyte concentrations

Reactive dyes exhibit a higher level of initial exhaustion, in the presence of small concentrations of electrolyte, on never-dried lyocell than on never-dried viscose and modal. This difference is particularly noticeable in the case of high substantivity bis-monochloro-s-triazinyl reactive dyes, which exhibit the same differentiated performance on the corresponding dried fibres. Low salt quantities (comparable to those used for applying direct dyes to cellulosic substrates) can therefore be used for applying high substantivity dyes and effect chemicals by an exhaustion process to both never-dried and dried lyocell substrates. © Color. Technol.