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<p>[QUOTE=&quot;fridolina, post: 3464152, member: 17433&quot;]Thank you! I’m starting to like her.</p><p><br /></p><p><br /></p><p><br /></p><p>The boring sponge drills canals into the shell with holes coming up to the surface through which the excavated material is dumped, a bit like the mole hills and it will continue to occupy that shell even after the mollusk has died.</p><p><br /></p><p>I think that the shell, already damaged by by the boring sponge, got the holes and canals filled with the melted soft shellac when stuck on the dop stick and that’s why the black spots are mainly on the reverse of the cameo. After finishing carving, the carver managed to clean the shellac from the flat surfaces but not from the holes and canals.</p><p>Just a hypothesis...</p><p><br /></p><p><br /></p><p><br /></p><p>Not really, just general knowledge.</p><p>About the boring sponges I learned when I wanted to find out what drilled the small holes on my Michelangelo shell cameo.</p><p>At the time, you mentioned that most of the cameos, you have seen with such type of damage, are conch shell.[/QUOTE]</p><p><br /></p>

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