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  1. Color of chemicals - Wikipedia

  2. Brown carbon - Wikipedia

  3. Colors of chemicals - chemeurope.com

  4. Why are chemicals kept in brown bottles - Quanswer

  5. Molecular Composition and the Optical Properties of Brown

  6. Chemistry of Atmospheric Brown Carbon | Chemical Reviews

  7. Chemical for brown algae removal? | MonsterFishKeepers.com

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

  9. Color for all the elements in the Periodic Table

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