dyes are employed for colouration of Cellulosics, Paper, Leather,
Silk, Jute etc. and are employed for economical shades where
requirements of fastness to various conditions are not exacting. The
light & Washing fastness of shades employing these dyes can be
improved by suitable aftertreatment.
cellulosics these are applied at near boiling temperatures in
presence of Glauber's salt or common salt. Aftertreatments are
further done to improve the fastness properties.