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IanB

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Posts posted by IanB

  10. Posted

    I take your point the grade of a coin is dependant on the wear of the coin. However in this case the initial assessment of the coin was that it was horrible but with some TLC it's become a much more desirable item.

    On 03/01/2017 at 9:03 PM, copper123 said:

     it even looks to be aproaching nvf grade , with less gunk on it every time it worked on

     

     

  15. Posted

    Thank you for the tip on where to look Matt. I have never thought to look there previously. I have also been pointed towards one by Pete. So now I am spoilt for choice.

    The difference in price between the two LCA coins is huge, the expensive one, I am sure is a good coin but not for me.

    I will try and photograph the final choice and post it, but my attempts at photograph so far are best deleted

  22. Posted · Edited by IanB

    It's just my opinion but I believe that if a piece of verdigris is flicked off and there is nothing left on the coin and the coin is not exposed to an environment that encourage the reaction needed for verdigris to occur then it will not come back.

    The problem we have is controlling the factors that cause it. 

    If we think about the above example of a coin with a spot of verdigris that is loose on the surface, at some point the conditions were perfect for it to start appearing maybe it was a small piece of sweat from a finger or moisture from a breath. Whatever it was it landed on the coin and started the reaction with the metal, maybe it was stored in a room with fluctuations in temperature and a spot formed. 

    Then someone comes along and flicks it off, as long as it loose and comes away clean and completely then that verdigris is gone. 

    If verdigris reappears on the coin then the conditions for it to be there have not been controlled e.g. Poor handling, storage, temperature etc. 

  23. Posted · Edited by IanB

    13 hours ago, PWA 1967 said:

    So does that mean it wont come back Ian ?.

    I am not a chemist so I cannot accurately say why verdigris appears but I believe it is a chemical reaction between the metal and the environment that it is in. Unfortunately the coins we like to collect are made of the metal that is the most likely to have this reaction, add to that moisture, bad storage and whatever else they react with and verdigris is one of the side effect.

    like most chemical reaction if you can remove a part of that reaction it will stop. 

    If a coin has some verdigris on it and it is continuing to grow then the conditions for it to do so must still be present.

    I have read that a small amount of baking soda will neutralise the reaction. If that is the case, and I have no way to prove it other than what I have read, then once it is stopped then as long as the other factors are controlled why should it grow again?

     

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