The modified dyes showed an excellent water solubility.But on printed paper, the modified dyes converted to water insoluble disulfide form exhibited a good water fastness.

• 改性后的染料具有良好的水溶性,但当打印到纸上,暴露于空气中,染料转变成为水不溶性形式,提高了打印品的耐水牢度。