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Difference in toning on silver bars - 1oz and 10oz

I bought these two silver bars about 45 years ago and always stored them in a box or in a safe, basically exposed to the air. However, for about 35 of those years, the 1oz bar was stored in a flip PVC holder (not sure it was actually PVC, but you get the idea). I've never cleaned either bar, but I have handled them with my bare hands dozens of times over the years.

For the past 10 years, the two bars have sat alongside one another, on my desk, fully exposed to the air 24x7x365.

As you can see, the 1oz bar shows significant toning and tarnishing, while the 10oz bar shows no signs of anything. In fact, it looks exactly the same as when I bought it all those years ago. Why do the two bars differ so much? Is there something that is preventing the 10oz bar from toning?


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