This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Synthesis of Indigopurpurin.svg Synthesis of Indigopurpurin from Indoxyl and Isatin en Synthese von Indigopurpurin ethanolischen Indoxyllsung Isatin und Natriumcarbonat de Own Yikrazuul Indigo dye
Page 2023 Free-images.com. All images are Public Domain