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.
Indigo.BaeyerDrewson.Synthesis. BaeyerDrewson indigo synthesis en Image Indigo original synthesis August en User Mothball Public Domain Dieckmann condensation Indigo dye
Page 2023 Free-images.com. All images are Public Domain