Use of Indigo derivatives, Indigo derivatives, process for dyeing a textile material with irreversible changing colour and textile material or clothing article

摘要

This invention refers to the use of new and known indigo derivatives as irreversible mutable dyes for textile materials and new compounds. The invention also refers to a process for dyeing textile materials, especially denim, with changeable dyes of irreversible Indigo colour and articles made with such textile materials.