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.
Ponceau R. Chemical structure of Ponceau Author date of creation selfmade by Shaddack November Source selfmade Copyright Public Domain PD Comments hires ChemDraw own assumed Shaddack Azo dyes
Page 2023 Free-images.com. All images are Public Domain