Toning is corrosion!

Discussion in 'Coin Chat' started by TypeCoin971793, Jul 8, 2018.

  1. NLL

    NLL Well-Known Member

    That is a sad result to the two one florin coins.
     
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  3. Kentucky

    Kentucky Supporter! Supporter

    Quibble...most plastics are not THAT air permeable, otherwise we would let babies play with dry cleaners bags. Some are more permeable than others. I think polyethylene is pretty permeable with polyester (seems to be preferred for coin applications) being less so. Hard plastic is often polycarbonate and is much thicker than flips or 2x2's. I still would like someone to start marketing polyvinylidine chloride for these applications. About as good as you can get for low gas permeability.
     
  4. They are that permeable. It just takes time.
     
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  5. -jeffB

    -jeffB Greshams LEO Supporter

    Yeah, I do miss real Saran.
     
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  6. -jeffB

    -jeffB Greshams LEO Supporter

    "I'm looking for a coin that's a real self-starter."
     
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  7. GDJMSP

    GDJMSP Numismatist Moderator

    A fair comment. But the reality is they are not that resistant to permeability either. For example, buy the thick freezer type of Ziplocks. Put some Oreo cookies in one and seal it. Lay it down. The in the morning pick it back up, put the bag up to your nose, and without opening it - smell. You know what you'll smell ? Oreo cookies. And that occurs in just 8 hours or so. Now that would not be possible if the bags were not air permeable.

    Another example, take a slabbed coin, one that is blast white. Put it in a sealed container and pump the right gasses into that container. In just 3 or 4 hours that blast white coin will have beautiful toning on it. And if you think well it's the pressure that's doing it - well it isn't. Yes it's happening that quickly because of the pressure, but that's all. For if you take the same blast white slabbed coin and put it away for a few years, when you get it out and look at it it too will be toned. Maybe not the same, but it will have toned.

    Ya see, the same gasses that get pumped into that sealed container exist in the very air we breathe. But at much lower quantities and at no pressure to speak of. So it takes longer for the slabbed coin to tone when it's just left out in the air - but it does still tone.

    Everything I described in the post about proper storage will slow toning down as much as possible. And that's the best you can do. Well, almost anyway. As I have stated in other threads they do make glass jars that can be sealed airtight. And you can store your coins in them and bring toning to a complete standstill, for a time. But glass jars bring other hazards with them - they break, they crack, and they get opened from time to time. So there truly is no way known to man to ever completely stop coins from toning. At least not one that any collector is ever going to use.
     
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  8. V. Kurt Bellman

    V. Kurt Bellman Guardian of The Farce, & Dead-Eye Master

    Also, whatever gasket is used to seal that jar can outgas all on its own.
     
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  9. Gregg

    Gregg Monster Toning Supporter

    Basically, all of your coins are going to be garbage soon and there is nothing you or your little dog can do about it.
     
  10. Gregg

    Gregg Monster Toning Supporter

    Even if you store them properly:

    Series-GFX-Re-Nuclear-series-post.png
     
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  11. V. Kurt Bellman

    V. Kurt Bellman Guardian of The Farce, & Dead-Eye Master

    The definition of which is the key.
     
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  12. Gregg

    Gregg Monster Toning Supporter

    This Friday afternoon at about 3:00 PM.
    You've been warned.
     
  13. GDJMSP

    GDJMSP Numismatist Moderator

    Ehhhhh - not really. Use proper storage techniques and your coins will pretty much stay the way you like them for your lifetime anyway.

    Well, except if that happens :D (we were posting at the same time )

    The real problem is that very few collectors actually use proper storage techniques, very few.
     
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  14. V. Kurt Bellman

    V. Kurt Bellman Guardian of The Farce, & Dead-Eye Master

    Can we push it back to after this Saturday morning's coin auction?
     
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  15. Michael K

    Michael K Well-Known Member

    Bad o-rings. This happens all the time and has taken down the space shuttle.

    The only toys we had were a stick with a nail in it, some broken glass and an empty dry cleaning bag. And that's the way it was, and we liked it.

    I've had coins ( not valuable) stored in plastic film containers for over 20 years and there has been no change. I do live in a low humidity environment, just saying.
     
  16. -jeffB

    -jeffB Greshams LEO Supporter

    But if you don't freeze your jars and then subject them to high g-forces while blasting them with high-pressure rocket exhaust, you'll probably be fine.

    Seriously, glass jar lid seals don't have much to do with shuttle O-rings. Different materials, different shape, different loads, and different failure modes.
     
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  17. V. Kurt Bellman

    V. Kurt Bellman Guardian of The Farce, & Dead-Eye Master

    Remember the old metal 35mm film cans? The ones with a gasket a little like chewed gum?
     
  18. Gregg

    Gregg Monster Toning Supporter

    I emphasized the exact reason why the coins didn't crumble into dust.
     
  19. The value of the coin has nothing to do with how it reacts to the environment.
     
  20. V. Kurt Bellman

    V. Kurt Bellman Guardian of The Farce, & Dead-Eye Master

    I am starting to believe that BOTH humid areas and the drier desert areas have their own unique silver-affecting qualities. Yes, some things happen more here in Humidityville, but I swear I've NEVER seen some types of ugliness on coins that I see from some southwestern collectors. What seems to be ideal is COOL and DRY. Now go find that. Aside from some clinging dust, that 1909 cent on Mars seems to be doing okay.

    "Mars ain't the kind of place to raise your kids,
    In fact it's cold as ..."
     
    Last edited: Jul 12, 2018
  21. Michael K

    Michael K Well-Known Member

    The value of the coins had nothing to do with the non toning, that's just what I kept in the old 35mm plastic film containers. I was just mentioning what I had in there.
    Perfect size for coins, easy storage (you can get a ton of these in a shoebox) and no cost. The negative is that you are unable to display the coins.
     
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