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Message:: [QUOTE="Lehigh96, post: 896408, member: 15309"]PCGS talks about the different types of toning and their effect on grade (positive, neutral, negative) in their book THE OFFICIAL GUIDE TO COIN GRADING AND COUNTERFEIT DETECTION (Chapter 5, pg 58-62). As you can see, the discussion is 4 pages long because it is not an easy subject to dissect.  There are many types of toning and each type can show varying degrees that will affect whether the toning is considered positive or negative.  However, the coin in this thread would always be considered to have light even toning.  Here is an excerpt from the book about Light Even toning. "This type of toning is only a few microns deep, and sometimes it is difficult to see unless it is viewed under good lighting conditions.  Sometimes this toning is so light that, as noted earlier, it is ignored.  If a coin has good luster that blooms through a light color, this has virtually no effect on the grade" Defining pretty is much more difficult and much more subjective.  But I guaranty that the TPG's think dark mottled toning that inhibits luster is just as ugly as you do and they do in fact penalize the grade of a coin for such toning most times.  This is a quote from PCGS about Dark Even toned coins: "Some coins have such deep toning that PCGS will not grade them, and they are returned, unsealed, as environmentally damaged."[/QUOTE]