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 Replies: 14 / Views: 1,112 |
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Pillar of the Community
United States
787 Posts |
HI all Now that you all have me looking at my Dunkin Donuts change, I ended up with this 1969 dime today and I have a question about it. It doesn't seem to have a lot of normal wear on the front, as I can still see the ear and other details, BUT it has this weird fine pebbling all over it, both sides, even in areas that wouldn't normally receive much wear. It has an overall duller than normal patina, with a small area that looks almost "smoked" to the right of the head. The BACK, on the other hand, does seem to lack detail. Can anyone tell me what's going on here? I am about 99% sure there is no clear-coating or anything silly like that on it. Help?  |
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Pillar of the Community
 United States
787 Posts |
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Bedrock of the Community
United States
19229 Posts |
May have been exposed to an acidic environment. Others will chime in.
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Pillar of the Community
United States
787 Posts |
Hmmm... but wouldn't an acid eat away the thin outer layer? I suppose if it were a very weak acid... Dunno, just overall strange look and feel while still looking like a decent dime, at least from the front.
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Pillar of the Community
United States
787 Posts |
Just had a thought... if any of you have ever seen something rather small that has been printed by a 3D printer, you'd almost think this is a 3D printed dime after looking at the second set of photos!
;-)
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Forum Dad
 United States
24180 Posts |
Quote:
I suppose if it were a very weak acid... Soda. May have spent some time in the bottom of a car cupholder. |
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Bedrock of the Community
United States
62064 Posts |
Some acids work on the cladding. (Which I don't know) Others working on the copper.   Note the quarter on the lower part of the image. The cladding was removed leaving the copper. The copper coins were thinned. Other times the copper was removed on the edge, the cladding left normal:  |
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Bedrock of the Community
United States
94367 Posts |
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Pillar of the Community
United States
787 Posts |
Really? It is so clean and despite the pebbling, the coin edge is still crisp.
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Pillar of the Community
United States
787 Posts |
... well, sorta crisp... but the two metals seem to have the same effect, none more than the other like that quarter pic above. EDIT: Ah, now I see coop's pic showing the edge of a dime and it does look like mine, with both metals "equal"... Hmmmmmmmmmm... I always thought a "Soda Coin" would have a lot more "ick" on it!  Edited by Nells250
11/08/2020 5:28 pm
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Bedrock of the Community
United States
62064 Posts |
The stronger the acid, the more metal it will eat away: even silver coins are affected by acid.  Note the thinned coin on the right side of the edge vertical view of a normal coin next to the thinned silver coin. |
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Pillar of the Community
United States
787 Posts |
WOW!  OK, that last set of images clinched it for me. In it you can also still see the two metals on the edge. Oh well... learn something new every day... still stay poor...   |
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Bedrock of the Community
United States
62064 Posts |
Knowledge of what something is, is priceless.
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Pillar of the Community
United States
787 Posts |
True! I LOVE seemingly useless information about as much as USEFUL information!
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Moderator
United States
56855 Posts |
Mild acid was my first thought, and my second was sandblasted. John1  |
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Replies: 14 / Views: 1,112 |
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Posted 11/08/2020 4:47 pm
