verdigris
A green or greenish-blue pigment resulting from the action of acetic acid on copper and consisting of one or more basic copper acetates.
Verdigris Copper Cancer and Coins
An unsorted accumulation of old 1c and 2c ...
VERDIGRIS
A green crust that forms on copper coins. Can be removed by soaking the coin in a hot solution of sodium sesquicarbonate in water.
VIRGIN COIN ...
Verdigris
Dirt, or other foreign substance sticking in the recesses of a coin's surface. Can be cleaned, if done professionally, without hurting the value of the coin.
Vest Pocket Dealer ...
Comments: This is a worn and mottled specimen with some dark areas and verdigris. On the obverse legend one dot in the visible rosette is hidden in a dark area (the dot closest to the outer row of beads) and not readily visible on the scanned image.
Not considered are the more serious defects such as graffiti, verdigris, severe detracting marks and obvious damage as well as unprofessional attempts at cleaning. Such problems should always be mentioned in addition to the grading of the coin.
False patina is in general black, coarse, and glossy or the color of verdigris, tender to the point of any sharp instrument. The genuine patina or antique encrustation is most often extremely brilliant and hard as the metal itself.
Lustrous medium yellow gold with a tiny spot of verdigris at back of hair. Choice for the grade and very appealing.
- The market accepts minor (one or two) 'green spots' - whether PVC or verdigris - on copper coins.
- On copper coins, either the grade or the color designation may curry the favor of doubt, but not both.
More on Altered Surfaces ...
The color of the patina on ancient bronze coins is usually green, and can range from very light green to a deep, lustrous, dark verdigris green. Sometimes patinas are seen in other colors, as well, such as blacks, reds, browns, and yellows.
CC638. Ming Rebels, Prince Yung-Ming, AD 1647-1662, YUNG-LI T'UNG-PAO/FU, S. 1307; FD 2118. Bold clear characters, brown patina with few spots of light verdigris, Very Fine+....SOLD Photo ...
mechanical means, such as buffing out a scratch or dig TRENDS Pricing guide found in "Coin World" TY'1 Type 1 TY'2 Type 2 UP5 Upright 5 UNC Uncirculated, but not brilliant, usually copper coins that have turned brown VERDIGRIS ...
 See also: Coin, Copper, Struck, Numismatic, Mint
  
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