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  1. Color of chemicals - Wikipedia

  2. PubChem

  3. Colors of all the elements in the Periodic Table

  4. Brown carbon - Wikipedia

  5. Colors of chemicals - chemeurope.com

  6. Atmospheric Brown Carbon: Sources, Optical Properties, and …

  7. Molecular Composition and the Optical Properties of Brown

  8. Chemistry of Atmospheric Brown Carbon | Chemical Reviews

  9. Why are chemicals kept in brown bottles - Quanswer

  10. The Chemistry of Colour: A Guide to the Dyes and Chemical World