Bí ọ̀nà sí indigo, ìlànà yìí yọ ọ̀nà yìuí kúrò ní aniline.ètò ní Litireso Gẹ̀ẹ́sì wọ́n maa ń pe ìdàpọ̀ ṣiṣẹ́ yìí ní  ìdàpọ̀ ṣiṣẹ́ Baeyer–Drewson , bí ó tilẹ̀jẹ́pé ẹni tí ó kọ ìwé àkọ́kọ́ ní Drewsen.àwọn ìtọ́kasí àyọkà àgéyí àjọ̀è chemistry.. 