Cleaning

The military way always seems to work. Round peg, square hole. But it gets done (a month or two late).

 

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So, were these copper oxides (I'm assuming various variants of CuO) bonded to the silver, or more just stuck on like adhesive?

 

I can't tell you.

Cause then I'd have to kill you.

 

one second after you put a coin into demineralised water...... it has done a small part of its job

 

That requires a hammer.

 

A very small part of its job. Why not start off with tap water and use DI water when it becomes necessary (final soak/rinse).

 

So, I didn't read the last page plus of this thread.
So, I think I have figured a few things out, @Insider
Insider has a big heart, there is evidence of corrosion on the op"s coin, cleaned and previous, I think that the Title said "cleaned"
@YOC @Pishpash
I think the coin has a great look to its restoration, From what I have learned from this thread, is that the silver that, I saw at the original post was saved, how it made it to the state that it is, will always will be a mystery?

@Insider, still at it huh?

 

Yeah, priced at $519.00 @

 

@physics-fan3.14 Say it is not so. I've been thinking. I believe the storyteller was a retired diesel driver. We were at Army-Navy CC in Arlington. There were some interesting people at the table and I see no reason for a Naval Officer to tell a lie in front of them! This was a WWII story that has nothing to do with today's operations. Now, I am really curious and no longer know any "old salts."

 

About the salinity and current flow...this is from Wikipedia...Today, evaporation of surface seawater (output) is more than the supply (input) of fresh water by precipitation and coastal drainage systems, causing the salinity of the Mediterranean to be much higher than that of the Atlantic—so much so that the saltier Mediterranean waters sink below the waters incoming from the Atlantic, causing a two-layer flow across the Gibraltar strait: that is, an outflow submarine current of warm saline Mediterranean water, counterbalanced by an inflow surface current of less saline cold oceanic water from the Atlantic. Herman Sörgel's Atlantropa project proposal in the 1920s proposed a hydroelectric dam to be built across the Strait of Gibraltar, using the inflow current to provide a large amount of hydroelectric energy. The underlying energy grid was as well intended to support a political union between Europe and, at least, the Marghreb part of Africa (compare Eurafrika for the later impact and Desertec for a later project with some parallels in the planned grid).[53]

 

THANKS @Kentucky That's what they did. See..current moved the sub. Low depth in, deep depth out. No motor necessary. I'll guarantee that every Navy knew that eventually.

In the 1940's the ocean was probably saltier and the direction was reversed.

 

Uh.........I don't think so...something like that occurred in the Jurassic or sometime like that.

 

I still see nothing here...."If I had, I could prove, AND possibly convince,".
It is all ifs, buts and maybes, total supposition.

If you "had that coin in hand" you could possibly convince what ?
That which you are willing to allege on the basis of a poorly (sorry Pish) lit image.

Sorry but it doesn't wash.

 

The ocean was probably saltier than the Mediterranean at one time - 1940's (?).

 

I'm also sorry. Two very clear and detailed explanations of the same thing is more than enough for most.

 

Here's a follis I managed to clean up rather nicely last year, not 100% but I'm satisfied for sure.

After:

Before:

And another very good success story, my denier of Carolingian emperor Louis the Pious, struck in Venice (nominally independent at the time but it was still under the thumb of the Frankish Empire):