Aromatic amines having a brown color

Zara78
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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.
 

Thread 'Molecular-level explanation of macroscopic phenomena: dissolving'

What I know and please correct me: a macroscopic probe of raw sugar you can buy from the store can be modeled to be an almost perfect cube of a size of 0.7 up to 1 mm. Let's assume it was really pure, nothing else but a conglomerate of H12C22O11 molecules stacked one over another in layers with van de Waals (?) "forces" keeping them together in a macroscopic state at a temperature of let's say 20 degrees Celsius. Then I use 100 such tiny pieces to throw them in 20 deg water. I stir the...
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