Half a croissant, on a plate, with a sign in front of it saying '50c'
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Airless silverware jar

 No oxygen means everlasting shine
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Cool it in the fridge for a few minutes and wipe off the dampness. No more humidity in this air. Now a small clean fire uses up all the oxygen in the airtight glass jar, with your silverware sealed in it.

Your silverware stays bright and shiny.

This is a nice looking glass jar or box, A small remotely controlled zippo lighter does the job. sealed air tight, but no need for a vacuum because the pressure inside is the same or nearly the same as that outside.

—pashute, Jun 26 2017

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       You can buy transparent plastic boxes with an in-built vacuum pump. You just close the box (in this case, with your silverware in it), then pump the handle until you get a decent vacuum. They would work nicely for this application.
—MaxwellBuchanan, Jun 26 2017
   

       Hydrogen. Flush the box with hydrogen, a strong reducing agent.   

       There will need to be a top-up mechanism as hydrogen diffuses through most things quite quickly. A small electrolysis unit would work fine.
—8th of 7, Jun 26 2017
   

       Or surround your precious silverware with things which will successfully compete with your silverware in bonding with Oxygen. For example, lumps of red-hot iron will be much readier to oxidise than room-temperature silver.
—hippo, Jun 26 2017
   

       Powdered metallic Potassium.
—8th of 7, Jun 26 2017
   

       Lumps of red-hot potassium must logically be even better.
—pocmloc, Jun 26 2017
   

       Argon. Displaces oxygen, non-reactive, doesn't diffuse away. Relatively easy to acquire.
—Loris, Jun 26 2017
   

       // non-reactive //   

       There's your problem, right there.
—8th of 7, Jun 26 2017
   

       Editing in answer to Max in particular but also to all the others...
—pashute, Jun 26 2017
   

       It's occurred to me before to preserve newly-minted coins by covering them in candle wax and then leaving them at the back of a shelf for the rest of my life.   

       Then, when I'm old and penniless, I can dig them out and melt off the wax. Hopefully they'll still be nice and shiny, making them worth far more than face value to collectors.
—Wrongfellow, Jun 27 2017
   

       So, this shelf with all the coins on ... where might it be, exactly ?
—8th of 7, Jun 27 2017
   

       Right behind the pile of half-melted candles.
—Wrongfellow, Jun 27 2017
   

       Aren't dirty old coins worth more than clean old coins? Whenever somebody posts an old coin or gun to /r/whatisthisthing, everybody is all "don't clean it!" because apparently that would destroy the collectibility value.
—notexactly, Jun 27 2017
   

       Rubber. This is in regard to consuming O2: rubber is great at that as the double bonds just beg for that O.   

       Used rubber items that would otherwise be thrown away would be perfect for this application.
—bungston, Jun 28 2017
   


 

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