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 Replies: 21 / Views: 2,285 |
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Valued Member
United States
179 Posts |
It was very hard to tell through the yellowed scotch tape...
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Pillar of the Community
United States
1247 Posts |
I've never trusted bags or wraps to store coins raw. Not even the polybags that are sold for coins. I don't know how safe they are but they always felt a bit oily to me. I do wrap Whitman boxes though with Hefty one gallon bags. I cut the sealing end off each bag and run one across each end of the box so they over-lap, and then wrap the bags tight with rubber bands.
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Pillar of the Community
United States
1767 Posts |
quote:
..has anyone ever did ot thought about buying 1 of those machines that sucks the air out of the bag and then seals it--just a thought.
Greg, I use one of those, but not to store my coins. When I mail a handful of coins I vacuum-seal them so they don't jingle in the package/envelope. mila_ |
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Valued Member
 United States
62 Posts |
good idea mila cent,I'll keep that in mind,,it may come in handy in the future
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Pillar of the Community
Belgium
2078 Posts |
Two things First food plastic is probably low or high pressure polyethylene PVC does not make it to the Food Contact grade I think There are a dozen nice plastics outside of PVC like Acrylic for hard capsules Second for sealing all coin lots or albums I have read on a German forum the members use their deepfreeze sealing vacuum equipment regularly for sealing coins . I would think that on an album or a sealed roll this practice has zero risk If there were no fingerprints under the scotch tape the condition of the coins after acetoning may be a nice surprise . I have several coins that were actually glued on pages to keep them in place  |
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Valued Member
United States
98 Posts |
To settle this issue of preserving coins, why hasn't someone asked
a test lab, etc for their opinion? I am confused with all of
the writings on this subject. I am also surprised that Dansco, Whitman,
Littleton, etc. haven't weighed in on this issue.
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Pillar of the Community
Belgium
2078 Posts |
I worked 8 years with testlabs
There are the two eternal questions
What testprotocol should be used ?
One 1000 hours in UV light shining on Florida 100% moisturised air
enriched to 100 ppm pure sulphur dioxide and heated to 50 C for good measure ? Oh and lets add two bars of pressure to be sure .
And if you agree on the testprotocol what measurement are you going to use
Discoloration? Corrosion ? Loss of weight ? Difference in selling price ? Sulphur content inside the wrapping ?
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Pillar of the Community
Czech Republic
803 Posts |
Also, keep in mind that in order for PVC to affect the surface of the coin - it has to be in direct contact with it. So, if you put a coin is a non-pvc flip prior to sealing it - you should be good.
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Pillar of the Community
United States
1767 Posts |
To answer the question I will test vacuum seal a coin. I've added a small change. Included with cent a Washington $3/28/2007 TO BE CONTINUED....Follow-up to be one month from today
Edited by Mila_cent
03/28/2007 3:23 pm
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Pillar of the Community
Belgium
2078 Posts |
I have been looking for an ultrasonic vacuum sealer but did not find any ; probably because I do not know the Flemish name for it  Is that the kind of ultrasonic heatsealer you used ? and how do you get the vacuum on the bag , with a pumping device ? If it is vacuum sealed I probably will not live long enough to see any changes on the coin posted  |
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Bedrock of the Community
United States
12437 Posts |
Edited by biokemist6
03/28/2007 1:58 pm
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Valued Member
France
98 Posts |
Hi all, being a electrical engineer and worked in the food industry for some years has taught me one thing and that is if oxygen comes into contact with any man made or natural material it will oxidise, causing either discolouration on paper, or copper sulphate ( which is the green on the copper and copper composite materials eg. Brass ) so by causing a vacuum in a non porous vessel one would eliminate, or keep under control the corrosion factor, in saying that one should use a non porous substance, some plastics are biodegradable and would become porous, given time.
So what I would suggest, is using the vacuum machine but not using biodegradable plastics! Another tip would be to coat the items in some non corrosive oil to further their longevity before sealing them.
I hope this will be of use to to all.
Cheers
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Pillar of the Community
Belgium
2078 Posts |
Thank you Biokemist6 I have never seen apparatus like that We are still in the Tupperware and deepfreeze stage Allthough for my red wine I have stoppers and a handvacuum pump |
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Valued Member
France
98 Posts |
My red wine does not need stopping Cheers |
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Pillar of the Community
Belgium
2078 Posts |
Sinbad My family has thousand years of beer drinking training ; I am the first generation that drinks wine So I need to practice One half bottle Merlot is my limit for the moment  Allthoug I love Montagne St Emillion too |
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First Page
Posted 03/27/2007 8:19 pm
