Hello guy! I have a question about how to keep coins safe. I bought a coin album on ebay from China [attachment=3552].
The problem is that after one year many coins in this album became green. How to fight it? Where do you keep the coins?[attachment=3553][attachment=3554]
Quote from: 'DarkDaiver' pid='99181' dateline='1475141887'Hello guy! I have a question about how to keep coins safe. I bought a coin album on ebay from China .
The problem is that after one year many coins in this album became green. How to fight it? Where do you keep the coins?
Those albums contain PVC and they will eventually destroy your coins, My advice is to get rid of them and get some PVC free pages and albums :ok:
That "Green" is PVC residue eating into the surface of your coins :(
Oh dear! PVC sleeves almost certainly. Not coin friendly. You should have bought some of these when you were in Australia. 20 Pocket Coin Album Pages for 2x2's Pack of 10 Archival PP (PVC FREE) (http://www.thepurplepenny.com/20,20-pocket-coin-album-pages-for-2x2s-pack-of-10-archival-pp-(pvc-free).html)
Remove the coins from the sleeves immediately and soak them in acetone will remove most of the green film.
Then look for mylar 2x2 holders and buy sleeves made from polypropylene. There are eBay sellers that do sell the good ones.
Can you give me some links where Ican buy them?
Buy the way what do you think about holders?
Quote from: 'JeffH' pid='99184' dateline='1475142437'Oh dear! PVC sleeves almost certainly. Not coin friendly. You should have bought some of these when you were in Australia. 20 Pocket Coin Album Pages for 2x2's Pack of 10 Archival PP (PVC FREE) (http://www.thepurplepenny.com/20,20-pocket-coin-album-pages-for-2x2s-pack-of-10-archival-pp-(pvc-free).html)
Remove the coins from the sleeves immediately and soak them in acetone will remove most of the green film.
Then look for mylar 2x2 holders and buy sleeves made from polypropylene. There are eBay sellers that do sell the good ones.
Quote from: 'DarkDaiver' pid='99181' dateline='1475141887'The problem is that after one year many coins in this album became green. How to fight it? Where do you keep the coins?
That album is PVC!
Smell it. The odour is distinctive. And it feels a bit slimy too.
PVC is a naturally rigid, white plastic. To make it supple and clear they add plasticisers. These leach out (hence the smell) and basically create acid which eats your coins.
The green is verdigris. Commonly referred to as 'coin cancer'. The damage is irreversible and permanent. The best you can hope for is to stop the degradation. Do some searches in here and you will find many threads on the topic.
You will also find numerous storage threads. The materials you want to use are Polypropylene or Polyethylene Terephthalate. Both come in stretched film versions, known as BoPP and BoPET respectively (Biaxially Oriented, as the film is stretched in two directions).
2x2 mounts are made of BoPET, as are Saflips. high-quality album pages (such as made by Ultra-Pro for example) are BoPP. Both are good protection against moisture and oxygen, though each excels at one and not the other.
I have started using Polypropylene tubs with tight fitting lids, and I add both oxygen and water adsorbent sachets into them. Moisture is probably the biggest factor in degradation, other than toxic storage media of course.
Also beware of papers made using Chlorine. Pretty much all office papers nowadays are acid-free, but the same cannot be said of cheap paper from the developing countries.
QuoteCan you give me some links where I can buy them?
Search for polypropylene in coins (http://www.ebay.com.au/sch/Supplies/83274/i.html?_udlo=&_udhi=&_ftrt=901&_ftrv=1&_sabdlo=&_sabdhi=&_samilow=&_samihi=&_sadis=15&_stpos=2852&_sop=12&_dmd=1&_ipg=25&_nkw=polypropylene)