A milky white coating left on the surface of a coin after an attempt has been made to remove heavy dark tarnish or also improperly rinsing a coin in hot water after being treated with dip etc.
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milky - describes the appearance on the surface of a coin. Usually a whitish area that is sometimes found on silver coins. The appearance is that of a milk color stain. Sometimes called a milk spot.
Rubber is an elastic hydrocarbon polymer which occurs as a milky emulsion (known as latex) in the sap of a number of plants but can also be produced synthetically.
PVC residue can first start to show as a cloudy or milky haze over the coin surface, a greyish film, maybe a slight green tinge in the right light.
On lower grade coins you get a light steel grey tone like cloudy milky water.
Sassanian Empire, ca late 3rd-6th Century AD, Stone Seal, 16mm diameter, central hole for wearing, made from a milky white translucent stone (probably quartz), design of a male head with head-dress on seal portion, intact and SUPERB condition....
He is said to have had 'full-flushed rose-red cheeks' that contrasted sharply with 'the milky whiteness of his flowing hair and beard.' His hands were white with long thin fingers described as 'transparent.
 See also: Point, Silver, Slight, Half, Numismatic
  
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