The aftertreatment of acid dyes on nylon 6,6 fibres Part 1. 1:2 pre-metallised acid dyes

Nylon 6,6 knitted fabric was dyed using a total of eight, commercial, 1:2 pre-metallised acid dyes and the dyed samples were aftertreated using three different commercial systems, namely a syntan, a syntan/cation process and a newly developed full backtan. When all dyeings were subjected to five consecutive ISO C061C2 wash tests, it was found that while all three aftertreatments imparted improved wash fastness, the newly developed backtanning system bestowed greatest wash fastness improvement towards repeated wash testing.