Silver pox, but not milky

[Ansel]

Good morning my esteemed friends, felt like getting some silver out of the safe today and found this on one of them, any ideas on the cause? It’s a 2018 Britannia from a tube of 25 mixed 17/18s. Seems to be about four or five have it although this the worst.  Not too bothered but interested to learn something new. Ta. Have a great weekend everyone.

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[SILVERFINGER]

1 hour ago, Ansel said:

Good morning my esteemed friends, felt like getting some silver out of the safe today and found this on one of them, any ideas on the cause? It’s a 2018 Britannia from a tube of 25 mixed 17/18s. Seems to be about four or five have it although this the worst.  Not too bothered but interested to learn something new. Ta. Have a great weekend everyone.

Second photo has been darkened and highlighted. 

 

Its not where the bloke making them decided to accidentally stamp the image of the coin into his finger with the machine, looks a bit blood spray cleanup to me 

[Bimetallic]

That's standard tarnish. It will be thoroughly cleaned by the aluminum foil and baking soda method.

[SILVERFINGER]

1 minute ago, Bimetallic said:

That's standard tarnish. It will be thoroughly cleaned by the aluminum foil and baking soda method.

Are you sure ? , I watch CSI miami, 

[SilverGameOfThrones]

Wellcome to the silver word , there is a reason why silver cost 80 less than gold,- 3-5% of your silver will need some cleanup overtime  

Try to use some Ammonia free  product like silver cleaner wipes  worked well for me for the last 3-4 years