Beryllium emission spectrum
<p>background credit:Teravolt,
foreground credit:Alex Petty,
</p>
mashup: Penyulap ;)
<a href="//commons.wikimedia.org/wiki/User:Penyulap" title="User:Penyulap">Penyulap</a>
2013-06-03
<span class="int-own-work" lang="en">Own work</span>