Triethyl borate burns with cool flame, which has green color due to the blue and orange lines in the boron emission spectrum.
<a href="//commons.wikimedia.org/w/index.php?title=User:Alrik123456789&amp;action=edit&amp;redlink=1" class="new" title="User:Alrik123456789 (page does not exist)">Albina Klueva, Sergey Obraztsov</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>