Enhancement in indigo uptake on cotton through metal salt pretreatment

摘要

A simple metal salt pretreatment of cotton has been suggested before multiple dip and nip dyeing of cotton with indigo. Among the various metal salt pretreatments investigated, the pretreatment with FeSO_4 has been found to be most primitive. A tentative mechanism for improvement in colour yield due to metal salt pretreatment has also been suggested.