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.
Vanadiumoxidnature. Vanadium metal oxidized on air turning to the black divanadiumtrioxide nearly fully oxidized and with more volume on the upper glass own Binter PD Vanadium Vanadium III oxide Samples of inorganic compounds
Page 2023 Free-images.com. All images are Public Domain