What Degree of Doctoring Has to Be Done to a Coin Before It Isn't Original/Natural Anymore?

Here's an interesting question. Everyone knows that most coins from the 1800's and earlier that have been in collections for quite some time have been either lightly wiped, cleaned, dipped, laquered, ect. All of these are forms of doctoring to make the coin either more attractive or make it better in some way to the current owner. The same thing applies to toned coins. There are many toned coins that have been doctored either to remove haziness, or to enhance the color or luster somewhat. When should one consider a coin doctored to the point where it is no longer original? How much doctoring needs to be done to a toned coin or to make a coin tone before it is considered Artificial? Do you feel that a light dip is doctoring a coin? Additionally, if a coin was placed intentionally in an environment where it will tone up nice and purdy, it is also doctored but depending on how long it takes to get the desired result usually determines what degree people view it as doctoring.
Brandon Kelley - ANA - 972.746.9193 - http://www.bestofyesterdaycollectibles.com
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And, of course, rapid toning is artificial.
-Amanda
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