Editor's note.
Horobin
Richard W
RW
D002627:Chemistry, Physical; D002648:Child; D002681:China; D004396:Coloring Agents / Q000266:history*; D049671:History, 18th Century; D006801:Humans; D007203:Indigo Carmine; D007211:Indoles / Q000266:history*; D010944:Plants / Q000737:chemistry
D004396:Coloring Agents; D007211:Indoles; D007203:Indigo Carmine