The article contains sections titled:
1.
Introduction
2.
Manufacturing Methods Using Sulfur Trioxide‐Amine Addition Compounds
2.1.
The Durand & Huguenin Process for Indigoid Dyes
2.2.
The Scottish Dyes Process for Anthraquinone Dyes
2.3.
The IG Farben (Hoechst) Process for Indanthrone Dyes
2.4.
Miscellaneous Processes
3.
The ICI Process Using Chlorosulfonate as Esterifying Agent
4.
Properties
5.
Uses
6.
Economic Aspects