Dark Toning Examples: Acceptable vs. Avoid

Discussion in 'US Coins Forum' started by IBetASilverDollar, Nov 8, 2017.

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  1. Insider

    Insider Talent on loan from...

    The part I see looks nice and is not terminal. Depending on the rest of it, don't touch it. This way it will attract the toning lovers and the folks who cannot wait to dip it. :D


    ...and Aluminum is also anodized to protect it further. Anodized aluminum signs are used by the Navy on ships.
     
    Insider, Nov 9, 2017
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  3. GDJMSP

    GDJMSP Numismatist Moderator

    I agree, but then that is just another way of saying the same thing I said - namely that there is no way one can know if black toning is truly terminal or not unless and until you remove it.

    But that doesn't change the fact that the toning IS black. Are there different shades of black - yes. Are there different kinds of black - yes. Are there different thicknesses of black - yes. But in the end they are all still black.

    Some try to differentiate by using terms like glossy black and flat black, saying that glossy isn't terminal and that flat is. But in my experience it just isn't always so, though I will readily admit that it is sometimes so. And that, well, that is why I said it the way I said it - you don't know, can't know, until you remove it.

    And Jeff - fair enough, I shouldn't have said all.
     
    GDJMSP, Nov 10, 2017
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  4. Insider

    Insider Talent on loan from...

    When I posted: "It all depends on what "BLACK" is." GDJMSP, posted: "I agree, but then that is just another way of saying the same thing I said - namely that there is no way one can know if black toning is truly terminal or not unless and until you remove it."

    I should have been more specific. I learned that in a conservation setting, the surface of the black area is examined using a stereo microscope. By doing that, in most cases, conservators are able to tell the condition of the underlying surface. If the surface was etched, it was best to leave the coin alone. If the surface was black, yet still in good condition - often retaining its original luster - it was worth a try.

    If we look at the vast majority of rainbow toned coins, the terminal black toning is on the edge and rim. These coins are highly prized even though their edge and rim is terminally CORRODED.
     
    Insider, Nov 10, 2017
    #23 + Quote Reply
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