Just picked up 60 rolls of BU 1960'61'62'63'64 penny's and some were wrapped in foil. Some were in coin tubes. I was happy to find the foil wrapped ones are so bright they are blinding. Was this a wise choice for the previous collector to do?
I recently picked up 2 rolls of BU 57 and 62 dimes. They were also wrapped in foil inside the older CIBC coin wraps. The coins are pristine. Seems like this is a way to reduce/stop the coins from tarnishing.
"As far as Aluminum goes, the reason for using it with copper may be "Galvanic Corrosion". Without getting into details, when two metals are in close contact (plus an electrolyte...let's just assume that over time atmospheric moisture does this), one of them will want to corrode more than the other. In this case, Aluminum is the sacrificial metal. The amount of corrosion is negligible, but it does not take much corrosion to create a visible impact on a fresh shiny copper coin"
Using aluminum was also mention on page 15 of 1964 Handbook of United States coins 21st Edition R.S. Yeoman. (insert below)
Two Yewts has posted the reason. The oxygen bonds with the aluminum easier than with copper. Use a new piece of foil to rewrap as it will be more reactive than the old piece.
That's very interesting. I didn't know that. I would have never thought to wrap the coins in aluminum. Glad it was re-shared being an old post and all.
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