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Keeping slabs healthy.

What extra precautions can be done to ensure coins in slabs stay exactly as they were when graded?

I have seen some graded coins that are 70's, but the seller will make comments that there are spots on the coin etc. that have occurred after they have been graded.

I live in an area that is quite humid during the summer (actually VERY humid). I keep my coins in a large safe, and I think the humidity is higher in there than outside the safe.

Obviously I don't want things growing on my coins!

Comments

  • PerryHallPerryHall Posts: 47,502 ✭✭✭✭✭
    Some people put a silica gel container in the safe to keep the humidity down but they need to be periodically recharged by heating them in your oven.

    Worry is the interest you pay on a debt you may not owe.
    "Paper money eventually returns to its intrinsic value---zero."----Voltaire
    "Everything you say should be true, but not everything true should be said."----Voltaire

  • I have a bunch of those already ;-) Never heard of recharging in the oven.

    Any other tips?
  • PerryHallPerryHall Posts: 47,502 ✭✭✭✭✭


    << <i>I have a bunch of those already ;-) Never heard of recharging in the oven.

    Any other tips? >>



    Once they absorb their capacity of moisture, they are no longer effective. Heating them in the oven for a couple of hours gets rid of the moisture and they are then like new again. Some people with gun safes use a low wattage heating rod made for this purpose to keep the humidity low---Golden Rod is one brand that comes to mind.

    Worry is the interest you pay on a debt you may not owe.
    "Paper money eventually returns to its intrinsic value---zero."----Voltaire
    "Everything you say should be true, but not everything true should be said."----Voltaire

  • Unlike a gun safe I have a 'real' safe so a cord is not an option. But based on your clue I found this little product:


    Eva Dry


    Much like what you said, the silica needs to be dried out, I think I will get a couple of those for my safe.
  • Zip lock food bags, other air tight food containers can provide an inexpensive extra layer of protection against humidity. Some spend more and get Intercept shield boxes for their slabs. Some folks put a shiny new raw penny in with the others, to act as a warning system. If there is humidity, it will turn first.
  • Batman23Batman23 Posts: 5,325 ✭✭✭✭✭


    << <i>I have seen some graded coins that are 70's, but the seller will make comments that there are spots on the coin etc. that have occurred after they have been graded. >>



    As already suggested, use a silica gel and keep it dried out.

    There seems to be a different problem that affects the PR/MS70 silver bullion coins caused by the rinse at the mint. That rinse has been the cause of some coins developing spots after grading. The term used here is "milk spots".

    A search on past threads will result in much discussion on this issue.


  • << <i>As already suggested, use a silica gel and keep it dried out. >>



    Yes, that was an excellent suggestion. Doing some googling I found the eva-dry product line, it looks to do exactly what I need. Can sit in my safe and the silica can suck up any extra humidity. It even has an indicator, then you plug it in and a built in heater dries it out.

    Sounds like an excellent solution and I have already ordered one from Amazon.

    Thanks for the feedback guys.
  • PerryHallPerryHall Posts: 47,502 ✭✭✭✭✭


    << <i>

    << <i>As already suggested, use a silica gel and keep it dried out. >>



    Yes, that was an excellent suggestion. Doing some googling I found the eva-dry product line, it looks to do exactly what I need. Can sit in my safe and the silica can suck up any extra humidity. It even has an indicator, then you plug it in and a built in heater dries it out.

    Sounds like an excellent solution and I have already ordered one from Amazon.

    Thanks for the feedback guys. >>



    You may want to put your coins in a tupperware type containers or zip-lock plastic bags with the silica gel otherwise the silica gel will get saturated with moisture fairly quickly. I'm assuming your safe isn't air-tight which most aren't.


    Worry is the interest you pay on a debt you may not owe.
    "Paper money eventually returns to its intrinsic value---zero."----Voltaire
    "Everything you say should be true, but not everything true should be said."----Voltaire

  • PlacidPlacid Posts: 11,299 ✭✭✭
    Yes you cant dehumidify the world only a small part of it so if your safe isnt air tight you are just going to keep getting more humid air in. Air tight containers with some silica stuff in them are the best way to go imho.

    This is what I have. It holds one pcgs box with a little room for silica.
  • I left a bunch of white unc.Barber dime NGC slabs in a canvas bank bag for a while once.
    They started to turn gold and orange around the rims.

    Steve
    Collecting XF+ toned Barber dimes
  • LindeDadLindeDad Posts: 18,766 ✭✭✭✭✭
    Along these lines has anyone ever tried using a very thin layer of silicon sealent on the edges of their slabs and seen what happens after a few years?
  • FunwithMPLFunwithMPL Posts: 333 ✭✭✭
    All of my slabs are in the Intercept Shield box's. I use the little box for each slab and also the larger box that ten of those little boxs fit in.

    Collector
  • RaufusRaufus Posts: 7,202 ✭✭✭✭✭
    Silica gel, Intercept Shield boxes as per the above post
    Land of the Free because of the Brave!
  • mikeygmikeyg Posts: 1,002




    Thanks to all for the good advice.Never thought about moisture before.
  • metalmeistermetalmeister Posts: 4,614 ✭✭✭✭✭
    Dry out silica every couple months in the oven.image
    email: ccacollectibles@yahoo.com

    100% Positive BST transactions
  • GrivGriv Posts: 2,804
    What do you mean, "Unlike a gun safe I have a 'real' safe .... "?

    I can ASSURE you that my "unreal" gun safe would make your "real" safe look like a piggy bank.
  • PerryHallPerryHall Posts: 47,502 ✭✭✭✭✭


    << <i>Thanks to all for the good advice.Never thought about moisture before. >>



    This is particularly important with fire safes since the insulation contains a concrete like material with trapped moisture which is released in a fire. The interior of fire safes tend to have very high humidities.

    Worry is the interest you pay on a debt you may not owe.
    "Paper money eventually returns to its intrinsic value---zero."----Voltaire
    "Everything you say should be true, but not everything true should be said."----Voltaire

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