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.
Richard Adolf Zsigmondy LOC. Richard Adolf Zsigmondy April September loc gov Not dated Before Unnamed photographer in employ of Bain News Service Ullstein Bild PDBain reflist Richard Adolf Zsigmondy
Page 2023 Free-images.com. All images are Public Domain