Can coins tone in slabs?

notlogical

Don't they need to be touching something like being in a album or a envelope, or a paper bank roll or something to tone? And don't they need to be exposed to air and stuff in the air to tone?

So does that mean coins in slabs now will never tone in the future because they are in the slab and aren't touching anything other than plastic?

If this was talked about before sorry!

numobri

Yes,coins can tone IN the slab.


Brian

JrGMan2004

The slabs aren't quite airtight... it takes a while for gases to seap in, but I do remember seeing a studying using Intercept Shield holders of some sort, and a simulation of aging over 20 years, and a comparison of what coins turned in the holders...

A coin is more likely to turn in the holder because of a dip that didn't get properly rinsed. and milkspots can show up later, especially on Silver Eagles

numobri

Some gases will come from the paper that the info is writted on.


Brian

messydesk

Old ANACS holders will tone coins. I have several silver dollars with a purplish crescent at the top of the obverse rim from the paper on the label.

Conder101

And evern if the seams are sealed, plastics are porous enough that eventually gases will difuse right THROUGH the plastic. So coins can still tone but it will be much slower. Unless they are reacting to outgassing from the labels (The early NGC slabs seem to be very prone to this. I have seen a lot of silver coins that are otherwise white, but with nice crescent toning where they are closest to the label.) or dip residue.

carl

I tried an experiment once with a cheaper slabbed coin. I left it in a container of distilled water for a few months. It had to be distilled water because normal water is thicker due to contaminates. Then put it into a refrigerator to see if there would be any condensation. There was. some moisture must have seaped in somewhere. There was no sign of this condesation prior to the test. However, if the slab is actually completely sealed properly, no air or moisture should be able to get inside therefore stopping any further toning. Plastics used today are fairly pure enough not to chemically react with coins. Nothing in most plastics contains elements capable of chemical reactions with coins. So that is also out of the question at least in the near future. Plastics and even glass over a very long time will disintegrate, decompose and have some minor reactions with items they are in contact with.
Many, many years ago I read of an experiment where someone claimed he had made the purest water possible. He sealed it in the purest glass container he could make and made sure no air was in the container when sealed. This was done some hundred years ago I believe. Today that container is in a science museum somewhere and is completely cloudy.

carl

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michael

Can coins tone in slabs?


yes YES

and it is not a good thing most all of the time

and if it is red copper red brown close to red copper and it is not properly stored you now gots a brown coin