Button of <b><a href="//commons.wikimedia.org/wiki/Plutonium" title="Plutonium">plutonium</a></b> metal above a calcium chloride salt cake.
United States Department of Energy
Attribution
<cite style="font-style:normal">ARQ contributors (2008). "<a rel="nofollow" class="external text" href="http://arq.lanl.gov/source/orgs/nmt/nmtdo/AQarchive/3rdQuarter08/page5.shtml">Plutonium Processing at Los Alamos</a>". <i>Actinide Research Quarterly</i> (3rd quarter): 10.</cite>