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.
Mohr Karl Friedrich. Picture of Karl Friedrich Mohr the scientist Journal of Chemical Education pages Ralph Oesper Should be public domain since the subject died over century ago PDArt Karl Friedrich Mohr
Page 2023 Free-images.com. All images are Public Domain