Downstream kev lag luam xav tau pib rov qab los tsis ntev los no.Tus nqi ntawm raw cov ntaub ntawv meta-phenylenediamine, cobalt chloride, thiab cobalt sulfate tau nce.

Ntau lub tuam txhab dyeing tau kho lawv cov nqi.Raws li qhov kev thov rau m-phenylenediamine nce, tus nqi ntawm disperse dyes thiab resorcinol yuav nce.