It's not a maker's name.
Indanthren (an artificial word created from Indigo and Anthracen) is the trademarked name for a category of high-quality dyes that are resistant to fading from sunlight and laundering. They were developed by the BASF company.
Textiles for which these dyes were used are called indanthrengefärbt.
Thanks for the reply.
great shirt.
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