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Color of chemicals - Wikipedia
Brown carbon - Wikipedia
Why are chemicals kept in brown bottles - Quanswer
Colors of all the elements in the Periodic Table
Colors of chemicals - chemeurope.com
Atmospheric Brown Carbon: Sources, Optical Properties, and …
Molecular Composition and the Optical Properties of Brown …
Chemistry of Atmospheric Brown Carbon | Chemical Reviews
Nitrogen dioxide - Wikipedia
How is brown created? - Color With Leo