Analytical chemistry laboratory, a close up of a drop of a reagent added to a sample in the beaker.
<a href="//commons.wikimedia.org/w/index.php?title=User:Gsxrak47&amp;action=edit&amp;redlink=1" class="new" title="User:Gsxrak47 (page does not exist)">Alexander Bogatyrev</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>