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Sep 28, 2021 at 18:30 comment added John I am not suggesting it is in contact, just connected to the same atmosphere. which over 700 years is close enough.
Sep 28, 2021 at 17:50 comment added LSerni @John I am not suggesting putting the sodium in contact with the metal of the weapons, just in the same atmosphere inside an appropriate crucible. Yes, argon would be better, but N2 is next to inert, easier to obtain, and less likely to outgas through the silicon.
Sep 28, 2021 at 17:21 comment added John sodium is going to damage the metal, and water that the sodium absorbs will release heavy alkali ions over centuries, and destroy the metal. combined with the copper it will also give the glass a charge which could do strange things to the metal. better to leave it out entirely or use a more stable desiccant like archival desiccated paper or desiccant clays. Also argon is better than nitrogen, nitrogen is still reactive.
Sep 28, 2021 at 16:02 history answered LSerni CC BY-SA 4.0