Aftertreatment to Reduce the Washdown of Leuco Sulphur Dyes on Cotton During Repeated Washing

Woven cotton fabric was dyed using C.I. Leuco Sulphur Black 1 and C.I. Leuco Sulphur Blue 5 and the extent of washdown that occurred during repeated wash fastness testing is determined. Three cationic fixing agents were then applied to the dyeings and the testing repeated. All three products reduced washdown, but varied in their ability to do so