A laboratory test tube with a green solution in a mans hand is heated over a fire

Foto: "<a href="https://www.ccnull.de/foto/a-laboratory-test-tube-with-a-green-solution-in-a-mans-hand-is-heated-over-a-fire/1013903" target="_blank">A laboratory test tube with a green solution in a mans hand is heated over a fire</a>" von <a href="https://www.ccnull.de/fotograf/marco-verch" target="_blank">Marco Verch</a> via <a href="https://www.ccnull.de" target="_blank">ccnull.de</a> - <a href="https://www.flickr.com/photos/30478819@N08/49590488897/" target="_blank">Bildquelle</a>, <a href="https://creativecommons.org/licenses/by/2.0/de/" target="_blank">CC-BY 2.0</a>