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<p>[QUOTE=&quot;2manybooks, post: 400483, member: 8267&quot;]Yes, shell may be one of the exceptions to the rule of thumb. They are a combination of protein material and calcium carbonate. Bynes was first recognized as a problem in shell collections stored in oak cabinets. Oak is very acidic, and the acids can react with the shell to form calcium acetate and calcium formate crystals. The reaction seems to be catalyzed by any chlorides remaining in the shells from their original salt water environment. So you want to avoid any acidic storage containers or materials. A good compromise might be to use archival, buffered boxes, and unbuffered tissue around the cameos. With cameos, you are also dealing with whatever the mounts are made of, which might themselves be sources of contamination. It is always more challenging to deal with &quot;composite&quot; objects.[/QUOTE]</p><p><br /></p>

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