The SAE milk spot's issue-"chlorine spots"??

Comments

• BonPecheur Posts: 157

  April 23, 2006 5:57AM

  There is no "solvent" per sea for chlorine. The best way to counter-act it is with water. IF the milk spots are indeed
  a "chlorine" issue, by the time they show up, its too late to do anything about it.

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• CoinHusker Posts: 5,034 ✭✭✭

  April 23, 2006 6:03AM

  My understanding on this is that the "residue" at issue is stamped into the surface of the coin at minting, therefore impossible to remove.

  Collecting coins, medals and currency featuring "The Sower"

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• dlimb2 Posts: 3,449

  April 23, 2006 6:08AM

  I would imagine in some way chlorine is used at the mint as some kinda cleaner...thus is why it shows up on the SAE's...Sun light and water are chlorine's worst enemy.

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• BAJJERFAN Posts: 31,615 ✭✭✭✭✭

  April 23, 2006 7:04AM

  If the milk spots were indeed due to chlorine origin they would likely end up on the coin in the form of chlorIDE. Any semblance of/to chlorine either from the gas or bleach would have been gone long ago. As you know or should know silver chlorIDE is a white solid substance. The haze on silver coins stored in PVC flips is due to silver chlorIDE.

  theknowitalltroll;

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• Jdurg Posts: 997 ✭

  April 23, 2006 8:41AM

  But AgCl (silver chloride) is light sensitive like most silver salts are. Over time, the white AgCl compound darkens as silver ions are reduced back to silver metal. So if the milk spots were silver chloride, you'd see them turn darker and darker as time goes on and more of them are exposed to light.

  I collect the elements on the periodic table, and some coins. I have a complete Roosevelt set, and am putting together a set of coins from 1880.

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• BAJJERFAN Posts: 31,615 ✭✭✭✭✭

  April 23, 2006 10:39AM

  So what kind of reducing agent is readily available inside of a slab?

  theknowitalltroll;

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• fishcooker Posts: 3,446 ✭✭

  April 23, 2006 1:07PM

  
  the grade guarantee.

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• Jdurg Posts: 997 ✭

  April 24, 2006 3:04AM

  
  
  << <i>So what kind of reducing agent is readily available inside of a slab? >>
  
  
  
  Ultraviolet light. The Ag+ ion is not all that stable and readily reverts back to metallic silver in the presence of ultraviolet light. Silver Nitrate, silver chloride, silver bromide, etc. all darken over time due to the action of UV light on the relatively unstable Ag+ ions. This is what makes photography possible.

  I collect the elements on the periodic table, and some coins. I have a complete Roosevelt set, and am putting together a set of coins from 1880.

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• BAJJERFAN Posts: 31,615 ✭✭✭✭✭

  April 24, 2006 5:06AM

  Yes but the Ag+ has to get its electron from smoewhere or it can't go back to Ag(0) unless it gets it from chloride which ends up as diatomic elemental chlorine or it gets it from some component of the slab itself.

  theknowitalltroll;

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