Are Slabbed Coins Vulnerable to Corrosion/Toning? Protect or no?

ChuckC

It seems as if slabs (mainly top grader's slabs) are very airtight and would sustain a coin's tone and luster in the short term. However, I have read a couple posts where slabbed coins have changed. I especially remember the story of one guy's mercury that was a deep purple (not the band) that turned to a red and blue tone much like my icon which begs the question: are coins vulnerable despite being in "airtight holders"? Are there any preventative coin supplies? What about the Intercept brand?

kieferscoins

Slabs are not airtight.

Intercept shield holders will help keep gases from entering the slab and turning the coins.

Cameron Kiefer

BillJones

Slabs are not airtight and coins can tone in them. A whole different case is coins that have been dipped that have not had the dip solution removed from them properly. Those coins will turn very quickly, sometimes with disastrous results on delicate items like Proof cents. Improperly silver coins can go bad too although that damage is sometimes partially correctable through a second dip with a very thorough rinse.

If a coin has not been treated with chemicals and is stable at the time that it was slabbed, given proper storage, a slabbed coin should be well protected for a long time.

airplanenut

As said, slabs aren't air tight.

My A-boxes are Intercept Shield 10-coin holders with the individual slab holders, as well. Those are my best toned pieces, and copper.

Jeremy

ChuckC

so would you suggest the intercept box w/ slab covers for my toned coins?

TonedPeaceNut

PCGS old rattler holder -- prior to 24 hour exposure to toning compounds



After exposure!



Coins can tone in the slabs -- especially the older PCGS and NGC slabs. The newer slab designs are much, much better.


TPN

ChuckC

I remember reading your photoessay threads about this topic a while back, TPN....While I may not soak my slabs in onions and eggs, you successfully demonstrated that "airtight slab" is too strong of an expression. I'll buy some intercept holders eventually. Thanks again to all.

magikbilly

It has been established that slabs do not render the coins they house impermeable to either mositure or sulphurous/acidic fumes. The experiment referenced here as well as the materials previously provided by myself and MrSpud document this as well. Storage of slabs in closed envoronments containing paper and other materials has also been discussed.

Best,
Billy

JoshL

Seal them in the PCGS Holders...then place them in the Intercept Holders...then wrap them with plastic three times around...then place them in a lock-box inside of a temperature controlled vault. Course you will never really get to see and enjoy your coins...but at least they will be safe from changing color.

magikbilly

Hi,

gotta watch that plastic - plasticizers outgas...


Billy

JoshL

<< <i>Hi,

gotta watch that plastic - plasticizers outgas...


Billy >>



LOL I was just kidding Trying to make a point.