toning - Shading of color on coins. Toning can be in many forms from dark or brown to various shade of other colors. It can cover the whole coin or more often part of the coin.
Devil's Face note On some of Bank of Canada notes, First Issue of 1954, Queen Elizabeth II's hair has a coincidental combination of shading and light that looks like a devil's face.
The shading was added to make it easier to isolate an individual entry.
The second improved the color balance between highlights and shadow areas but overemphasized surface variations introducing color shadings not seen on the coin itself.
A gray card is simply a card which is a precise degree of gray, or neutral, shading. (Cost is about $15 for a set.) With the light and camera in place, place the gray card in the position of the coin.
On some of Bank of Canada notes, First Issue of 1954, Queen Elizabeth II's hair has a coincidental combination of shading and light that looks like a "devil's" face. Shading was quickly changed under public pressure to remove the "face." ...
The V is backward left to right and has its heaviest shading on the right side, a curious diecutting error. This variety is elusive, though hardly a rarity. Enough exist that every advanced pattern collector has the chance to own one.
Arms of Jamaica; Shield with a cross, five pineapples in the cross, crocodile on top, all within a circular border, banner below. Vertical shading lines in the cross of arms
JAMAICA FARTHING
KM-24 Farthing (Copper-Nickel) : 1914-1934 ...
This behavior is known as bid shading. These two auctions are also theoretically equivalent, but in practice Dutch auctions will produce less revenue than sealed first-price auctions (one of the important results of Experimental economics).
 See also: Coin, Silver, Dollar, Double, Reverse
  
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