This Morgan dollar has black spots on the reverse. At first I thought they were gunk and could be removed soaking in distilled water and acetone. Someone mentioned they are carbon spots and read they may be silver oxide spots. PCGS Policy for Spotting of Modern Silver Coins The Spot Problem. The December 17, 2012 issue of Coin World had an article describing the Mint's acknowledgement of the "white spots" problem for modern silver coins, especially the .999 American Silver Eagles. In this video, we talk about the white spots or "Milk Spots" that are found on some government silver bullion like the Maple Leaf and American Eagle. Most often found on RCM coins, the Canadian A spot seen mainly on copper and gold coins, though also occasionally found on U.S. nickel coins (which are 75 percent copper) and silver coins (which are 10 percent copper). Carbon spots are brown to black spots of oxidation that range from minor to severe - some so large and far advanced that the coin is not graded because of environmental NGC says that it will factor milk spots into its grading of modern silver coins as it does for black spots on copper coins and red spots on gold coins. Large spots and those that are very distracting will result in lower grades, and if a coin has heavy spotting, it may receive a details grade with a notation about environmental damage. Step 6: Rinse Silver Coin With Cold Water. Rinse the silver off in the cold water, this step will help to remove any baking soda residue. Oftentimes, if this step is skipped, small white spots can remain on the silver as dried baking soda. Step 7: Inspect Your Coins. Inspect the silver for any remaining tarnishing or left-over baking soda residue.
A spot seen mainly on copper and gold coins, though also occasionally found on U.S. nickel coins (which are 75 percent copper) and silver coins (which are 10 percent copper). Carbon spots are brown to black spots of oxidation that range from minor to severe - some so large and far advanced that the coin is not graded because of environmental damage. NGC says that it will factor milk spots into its grading of modern silver coins as it does for black spots on copper coins and red spots on gold coins. Large spots and those that are very distracting will result in lower grades, and if a coin has heavy spotting, it may receive a details grade with a notation about environmental damage. Black spots and tarnish that appear on sterling (Silver Sulfide) ( rubber bands, eggs and other materials particularly those with sulfur will rapidly turn the silver areas dark) can sometimes be removed with water, baking soda, and a rubbing action.
Good Morning: I have kept silver coins for many years. Back then, the coins would come encased in plastic and I often left them that way. Bad idea, I now know. Recently I took some out of a drawer about twenty years later and two had a heavy black spot on them with an oily looking substance in th It's pretty simple, when silver tones it eventually turns black. That is the nature of silver. As for there being black spots instead of the entire coin being black, rather obviously at some point something got on the coin that caused those tiny areas to tone faster than the rest of the coin. Black spots have nothing to do with 'carbon' more likely they are Silver sulfide deposits caused by the oxidation of Ag metal to Ag- and reaction with sulpher also possible as Copper sulfidebut I have seen these spots on Quote: pnightingaleEvery schoolboy, back in the days when every schoolboy collected coins, used to know that black marks on circulated silver coins could be easily removed with a pencil eraser. They call them rubbers in England but for some reason Americans find that funny. Strange folks. A spot seen mainly on copper and gold coins, though also occasionally found on U.S. nickel coins (which are 75 percent copper) and silver coins (which are 10 percent copper). Carbon spots are brown to black spots of oxidation that range from minor to severe - some so large and far advanced that the coin is not graded because of environmental damage. NGC says that it will factor milk spots into its grading of modern silver coins as it does for black spots on copper coins and red spots on gold coins. Large spots and those that are very distracting will result in lower grades, and if a coin has heavy spotting, it may receive a details grade with a notation about environmental damage.
2 Dec 2007 A black spot will remain on the true silver coin but not on a non-silver coin. What's happening? Mustard contains natural sulfur compounds. 3 Sep 2007 Silver – Bright silver to brown to black. Sometimes rainbow-style colors appear in the toning of silver, which can really add to value.
A spot seen mainly on copper and gold coins, though also occasionally found on U.S. nickel coins (which are 75 percent copper) and silver coins (which are 10 percent copper). Carbon spots are brown to black spots of oxidation that range from minor to severe - some so large and far advanced that the coin is not graded because of environmental damage. NGC says that it will factor milk spots into its grading of modern silver coins as it does for black spots on copper coins and red spots on gold coins. Large spots and those that are very distracting will result in lower grades, and if a coin has heavy spotting, it may receive a details grade with a notation about environmental damage.