Glass bottle in a furnace for making glass during demonstration at a Murano glass factory in <a href="//commons.wikimedia.org/wiki/Venezia" title="Venezia">Venezia</a>.
<a href="//commons.wikimedia.org/wiki/User:Wknight94" title="User:Wknight94">Wknight94</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>