Examples from the Web for diamine
With all these peculiarities of the Diamine and other direct dyes the union dyer must make himself familiar.
It is probably a diamine, but has not been obtained in sufficient quantity for accurate chemical study.Poisons: Their Effects and Detection|Alexander Wynter Blyth
Diamine blue B X. Work at the boil to shade, then lift, wash and dry.
Diamine brown V. Dye at the boil to shade; lift, wash and dry.
Phenol for claret from Diamine cutch, and for gold yellow from Primuline, etc.