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Cast bubbles?

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Numerianus:
Could you, please, explain the origin of this holes in the silver surface?

Scipio Helveticus:
If I were to venture a guess(and I emphasize Guess), I would say cast bubbles, since the corrosion I have seen on silver tends to sprawl in shapeless massess, instead of isolated little pits.

berserkrro:
I saw pitting just like that on silver. More, I have a denarius cleaned by myself (a Faustina Junior) having cuprous oxyde (red) and it left the cleaned portion of the surface close to this one, although with a less number of small "holes". Anyway I intentionally left a part of the coin still covered by cuprous oxyde, because of some wrong general opinion that in silver we cannot find pitting corrosion. If the soil is having a certain composition, then the migrated copper is reacting with water and oxygene forming CuO or Cu2O.

curtislclay:
I agree with Berserkrro: apparently corrosion pits.  Casting pits are all the same size, not some large and some small, and without such sharp edges.

Robert_Brenchley:
The relief looks too sharp for a cast, unless it was an extremely good one that wouldn't have pits.

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