Close-up of a plasma torch used in an ICP-TOF-MS. Usually the flame has a light purple color. However, due to the viewing window, which is intended to reduce high-energy radiation, it is colored green.
<a href="//commons.wikimedia.org/w/index.php?title=User:MartinSchaier&amp;action=edit&amp;redlink=1" class="new" title="User:MartinSchaier (page does not exist)">Martin Schaier</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>