The Bittersweetness of Green Sep 09, 2007 Written by Filed under Building Blocks, Coumarin, Decoding Obscure Notes, Fougère, Hay, New Mown Hay Previousx / Nextz Tweet The Bittersweetness of Green Natural Sources of Coumarin, originally uploaded by Ayala Moriel. Written by Filed under Building Blocks, Coumarin, Decoding Obscure Notes, Fougère, Hay, New Mown Hay Tweet