Aromatic amines having a brown color

Zara78
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TL;DR
I did not find any scientific sources about aromatic amines turning brown. Moreover, when analyzing with UV-VIS spectrophotometer they give a flat curve in the visible area despite having this brown color, how is this possible?
Aromatic amines having a brown color
 
Chemistry news on Phys.org
Google suggests they oxidise.
IE decompose.
 

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