Chemiluminescence is accompanied by reaction of hydrogen peroxide and luminol. This is an image from video <a rel="nofollow" class="external free" href="https://youtu.be/8_82cNtZSQE">https://youtu.be/8_82cNtZSQE</a> .
<a href="//commons.wikimedia.org/wiki/User:Tavoromann" title="User:Tavoromann">Tavo Romann</a>
<span class="int-own-work" lang="en">Own work</span>