There are two reactive groups in Bi functional Dyes. These two reactive groups are well known for their excellent dyeing activity. But bifunctional Dyes with excellent dyeing capacity can be only created through correct selection process of appropriate reactive groups and appropriate chromophores. A few bifunctional reactive dyes had been developed which carried mono-chlorotriazine and sulphato ethyl sulphone reactive.
As Bi functional Dyes contain two reactive groups either identical in
nature or not so these dyes have higher degree of fixation over all
other kinds of dyes.