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Aren't the slabs airtight?
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33 posts in this topic

1 hour ago, Conder101 said:

It is acceptable to display them any way you want to.


California "knows" that everything causes cancer or reproductive harm.

But that was presented in a "proposition" presumably put before the voters.  And what if it hadn't passed?  We live in a strange world.

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No TPG encapsulates coins in a closed, moisture-free, neutral atmosphere such as nitrogen, helium, or argon. No slab is routinely hermetically sealed. There is very limited information on whether archival labels and ink are used, or if any internal slab parts (prongs, gaskets, etc.) are completely inert. Even the plastic used in the slabs can be suspect.

These sites might help: https://www.nps.gov/museum/publications/conserveogram/18-02.pdf



Try this one, too. https://architizer.com/blog/inspiration/stories/naum-gabo-plastic-sculpture-decay/


Edited by RWB
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On 3/9/2021 at 4:08 PM, Quintus Arrius said:

True, but wouldn't they be expected to degrade over time?  O rings... hmmm, now where have we all heard about them before?

They would last many years in the right environment. 

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