Byproducts during <b>Degasification of Stone Coal</b> – Coal-Tree • <a href="https://en.wikipedia.org/wiki/en:Basel" class="extiw" title="w:en:Basel"><span title="city on the Rhine, in Switzerland">Basel</span></a>, Pharmazie-Historisches Museum (Museum of Historical Pharmacy)
<a href="//commons.wikimedia.org/wiki/User:Mattes" title="User:Mattes">User:Mattes</a>; edited by user <a href="//commons.wikimedia.org/wiki/User:Jaybear" title="User:Jaybear">Jaybear</a>
<span class="int-own-work">Self-photographed</span>