Primary <a href="//commons.wikimedia.org/wiki/Efflorescence" title="Efflorescence">Efflorescence</a> on a Masonry Wall.
<a href="//commons.wikimedia.org/wiki/User:Mattes" title="User:Mattes">User:Mattes</a>
2006-10-22
<span class="int-own-work" lang="en">Own work</span>