Thioindigoid Dye

Thioindigoid Dye


(or thioindigoid), any of several vat dyes of the indigoid group that contain sulfur. The parent compound of the thioindigoid dyes is thioindigo (2,2-bis-thionaphtheneindigo), the sulfur analogue of indigo:

Thioindigoid dyes are used to dye cotton, wool, flax, rayon, silk, and fur; they produce orange, red, violet, brown, and black. Various shades may be obtained by using different thioindigoid derivatives, particularly asymmetric derivatives such as 2-thionaphthene–2-indolindigo.

Thioindigoid dyes form fast colors. They are obtained from aromatic amines and certain other aromatic compounds by a complicated multistage process.


Stepanov, B. I. Vvedenie v khimiiu i tekhnologiiu organicheskikh krasitelei [textbook]. Moscow, 1971.