Carbon Spots:
Not really carbon in the chemical sense but a term to describe dark spots on the coin's surface. Generally the result of mishandling.
Choice:
A term to describe a particularly nice example (See Gem and Proof Like).
Coin: ...
carbon spot 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 spot: a small spot of corrosion or oxidation on a coin caused by a spot of moisture. When you talk around coins - Say it, don't spray it!
Carson City: official U.S. Mint in Carson City, Nevada that issued coins from 1870 to 1893.
Carbon spot - A dark discoloration on the surface of a coin, possibly caused by a planchet imperfection prior to striking, or it may be caused by improper storage of the coin.
carbon spot: a brown or black spot on a coin, caused by impurities or oxidation
cartwheel: a visual effect where the coin's luster appears to spin in a radiating fashion. Considered desirable.
Carbon Spots - These are small black spots of carbon that appear on a coin. They can not be removed and can grow over time.
Cartwheel Effect - The effect a highly lusterous coin has when rotated in a circular motion ...
carbon spots - Spots seen primarily on gold and copper coins. Carbon spots are dark brown to black spots of oxidation. Carbon spots can decrease overall quality and value of a coin.
Carbon spots
Detrimental oxidation specks appearing on the surfaces of a coin.
Carbon Spot
A term used to describe the colour of dark spots found on the surface of a coin. The spots do not normally comprise the chemical 'carbon' and are more commonly found on bronze coins.
Center Thread ...
CARBON SPOT
A dark discolouration upon the surface of a coin thought to be composed of organic material such as wood, sawdust, coal particles, etc., which was residing on the planchet prior to annealing.
Carbon spot
A dark discoloration on the surface of a coin. It is possible that this discoloration is caused by a planchet imperfection prior to striking, or it may be caused by improper storage of the coin.
Carbon Spots - Small spots of corrosion, usually seen on copper coins.
Carbon Spot - Brown or black spots usually found on copper and gold coins. The spotting is caused by oxidation and, if severe, prevents a coin from being graded.
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Carbon Spot
A black discoloration on a coin which was on a PLANCHET prior to the ANNEALING process. The discoloration may have been caused by burnt wood or sawdust, charcoal particles or sulfides.
Often, carbon spots will form on the surface of silver, nickel, or copper coins, damaging them to a certain extent and lowering the value. Caused by impurities in the air and/or metallic alloy of the coin.
Carbon Spot Small dark spot usually on copper or nickel coinage, usually not removable without abrasion CH Choice, superior or above average for the grade (eg.
Sometimes, no matter how careful you are you'll find that your coins will develop toning or carbon spots while they are in your albums.
Contaminants/Environmental The black specks often seen on nickel (and cent) coinage, do not appear to be true 'carbon spots' except in fairly rare circumstances.
Copper is a chemically active metal and, depending on the storage environment, can suffer from carbon spots and corrosion marks. These imperfections must be considered when grading.
1929 1899 MS-63. Brilliant and frosty. Carbon spot at lower right reverse.
Date logotype low.
Purchased from Stanley Kesselman, May 2, 1973.
it is rarely found on coins made for general circulation and is less common on coins minted prior to the mid-1960's. Attractive early cameo coins often sell for substantial premiums over non-cameo's of the same date and mint mark. carbon spotting ...
I have read of other similar markings, but haven't seen them in my limited experience. Possibly, only the highest grade coins will show these markings. Many of the higher grade coins I've seen have been marred with unattractive carbon spots.
 See also: Carbon, Coin, Grade, Collector, Gold
  
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