To bleach that dye out I'll have to go over his face with a needle, pore by pore, and hammer in the indigotin disulphonic.    From Wordnik.com.  [The Stars My Destination]

The woad plant contains less indigotin, the coloring material within the source, and it requires higher heats to create color in textiles.    From Wordnik.com.  [The Creation of Color in Eighteenth-Century Europe] Reference

Specially worthy of notice are the discoveries of artificial alizarin, in 1868, by Graebe and Liebermann, and of indigotin, in 1878, by Adolf.    From Wordnik.com.  [Scientific American Supplement, No. 810, July 11, 1891] Reference

The stamps are usually covered with a black ink made of sulphate of iron, and this is fixed by myrobalans; the Nilgars usually dye a plain blue with indigotin.    From Wordnik.com.  [The Tribes and Castes of the Central Provinces of India Volume II] Reference

In 1865 he started his work on indigo - the blue dye had fascinated him since his youth-and this soon led to the discovery of indole and to the partial synthesis of indigotin.    From Wordnik.com.  [Adolf von Baeyer - Biography] Reference

But indigo white is an unstable substance on exposure to air, the oxygen of the latter attacks the hydrogen which it has taken up, and indigotin is reformed, the indigo white changing again into indigo blue.    From Wordnik.com.  [The Dyeing of Cotton Fabrics A Practical Handbook for the Dyer and Student] Reference

UPDATE: The molecule is indigotin or indigo dye.    From Wordnik.com.  [Sandwalk] Reference