A Little Help From My Friends .

Noted you are from up-state New York, there are great swings of humidity levels during the summer months.


Well, that is a process that a number of CCF members recommend.
Which I agree.
Maybe storing them in a Zip Lock bags would also help.

Pertinax , I use cardboard 2x2's . I don't know the brand as I buy them in bulk at the LC Show .
bpoc1 , I can't put them in zip locks, there in plastic pages for my loose leaf book .
jbuck , the material of dresser is wood and particle board . and the only other things in that draw are other loose leaf books of different denominations .

The culprit may be the particle board. Particle board (usually known as chipboard in the UK) is a no-no for coins.
It's usually made from wood chips, wood shavings and sawdust from different woods and a resin or glue.

Some resins emit a gas which may be damaging to coins and some woods are unsafe too.

That's the reason why quality wooden coin cabinets are expensive, they're made of mahogany or other safe woods and don't use glue.

I'd use a metal box or filing cabinet rather than something made of particle board.

It's possible, too, that the culprit may be the cardboard flips, if they're using glue or plasticisers that emit gases.

I read somewhere here on the forums that putting a bit of scotch tape over the open sides of a 2x2 can help cut down airflow and help prevent changes in toning.

I mentioned glue from the self adhesive 2x2s as a concern before and someone brought up what about the glue that attaches the Mylar to the cardboard? I don't consider 2x2s for long term storage of high grade coins, preferring air-tites and Saflips, but your result is surprising and very concerning.

ok, you guys have me thinking.
I have built a metal barn , made it into my house.
built a 4x11 closet that have chip type shelves.
the store next to me gave me 88 , 2'x4' foot shelve boards . I have built shelving out of them.
my coins are in slabs , 2x2 card board holders , zip lock bags and bank type rolls (open end).
proof sets , mint sets and silver eagle boxes , all from the mint.

what should I do ?
sorry to bust in this post, but it might help another.

And put silica gel inside the bags as well! Copper is very reactive and moisture is a major source of toning. The toning reaction is usually an oxidation reduction reaction that REQUIRES moisture to proceed. If you don't want the gel in the bag with the coins double bags them and put the gel in between the bags.