1. Whether vat dye, disperse dye or reactive dye, the color fastness mainly depended on dye structure and dyeing process.

2. Indigo: Blue VAT dye, obtained until about 1900 entirely from some species of the indigo plant.

3. Discharge printing process with vat dye is suitable for cellulose plain velvet fabric with deep ground color and gives ideal effect.

4. Maily used to dye for vat dye, reactive dye and acid dye. It can work as dispersant for acid staining pad and pigment pad dyeing, auxiliary for reducing dye powder and slurry.

5. The result indicates that the application of vat dye paste to the discharge printing of real silk fabrics can obtain brilliant shade and good color fastness, but lower the strength of the fabrics.

6. Indigo : Blue vat dye, obtained until about 1900 entirely from some species of the indigo plant.

7. Suspension vat dye padding is a conventional way to dye dense weave poplin.

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8. It is mainly used as disperse auxiliary in disperse dye and vat dye. It can also work as commercial filler to disperse dye by working with other dispersants.

9. It can work as dispersion auxiliary in disperse dye and vat dye, especially in red and other kinds. Can also be used in coating and printing.

10. Discharge printing of the real silk fabric was performed with vat dye paste for printing the patterns and vinyl-sulfone reactive dye for the ground.

11. Accuracy of three test methods was studied. As conclusion, spectrophotometry featured high stability, simple and rapid operation, has important application value for the testing of vat dye colo...