<p>I'm pretty sure some of this is magnesium, and other easily corrodible stuff. Maybe even Metalite alu + balsa sandwich...
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<a rel="nofollow" class="external text" href="https://www.flickr.com/people/9998127@N06">Bill Abbott</a>
CC BY-SA 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/wbaiv/4255147663/">Starboard aft F-8, mostly bare metal</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:High_Contrast" title="User:High Contrast">High Contrast</a></li></ul>