Black patina on silver coins

Discussion in 'Silver Coins' started by TreasureHunter, Aug 6, 2020.

  1. TreasureHunter

    TreasureHunter Well-Known Member

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    Hi,

    What are your opinions on black tarnish on silver coins? Is it good or bad to have?

    Here is an example from the internet:
    [​IMG]

    I know that this kind of tarnish can be created artificially with the help of eggs.
    Some acid-cleaned coins also produce this black tarnish (I believe it's a reaction to sulfur exposure).

    What I'm asking: is this black tarnish a good thing? Should you or should you not collect coins with this black patina?

    It seems like this doesn't add much to the coins' value at all.

    Should these coins be cleaned? With what?

    The yellowish silver tarnish is a lot more beautiful, but quite many coins do have this black tarnish (which I do like to some extent, but the yellowish one is far better looking).
     
  2. opti

    opti Member

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    from what I have read, when it comes to cleaning coins it generally is best to not do it. Especially historical or rare pieces. cleaning is generally an abrasive process can take some details away.
     
  3. TreasureHunter

    TreasureHunter Well-Known Member

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    ^
    True. But I am asking about whether to avoid buying coins with black patina or not. Professionally speaking, is this particular patina regarded as something "negative"?

    It seems like most collectors prefer the conventional yellowish patina on silver.
     
  4. Jason1

    Jason1 Well-Known Member

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    dont think it hurts grading at all, silver coins tarnish and grading companies know that. as long as its natural tarnish.

    I believe sulfur makes silver coins go rainbow not black?
    If i remember correctly bank bags often contained sulfur and some left for many years in old bags went rainbow colored
     
    Last edited: Sep 4, 2020
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  5. SteelHand

    SteelHand Well-Known Member Silver Stacker

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    Gonna have to disagree with you there.

    20200904_201111.jpg
     
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  6. Jason1

    Jason1 Well-Known Member

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    rainbow toners can be worth a fortune, especially certain morgans.

    and to the op DONT EVER CLEAN COINS, especially Numi's, thats rule number 1 of coins
     
  7. TreasureHunter

    TreasureHunter Well-Known Member

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    ^
    But can't rainbow tones be generated artificially? Many newer coins sell with rainbow tone on eBay and they are artificially toned.

    I noticed that some coin pockets do in fact create this rainbow tone. But not necessarily as nicely as on the picture above.
     
  8. Golden ChipMunk

    Golden ChipMunk Well-Known Member

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    Formation of Blue to Rainbow on my Lunar 1 oz SI Ag Monkey which is inside the capsule; it is still growing.
    Really love it.
     
  9. Golden ChipMunk

    Golden ChipMunk Well-Known Member

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    1 oz Monkey Magic

    1ozmonkey.JPG

    1ozmonkey2.JPG
     
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  10. TreasureHunter

    TreasureHunter Well-Known Member

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    ^
    "CHIP" meaning what?
    At first glance I thought it says "chimp" :D :D :D
     
  11. kilo

    kilo Well-Known Member Silver Stacker

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  12. Golden ChipMunk

    Golden ChipMunk Well-Known Member

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    @kilo , The Patina when I bought wasn't that much. A slow process I guess.
     
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  13. Gazza79

    Gazza79 Well-Known Member Silver Stacker

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    Got to love a little natural patina :)
    20200905_171033_resize_39.jpg

    1oz 999 fine silver piece.
     
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  14. kilo

    kilo Well-Known Member Silver Stacker

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    On the OP, for me tarnish (Patina) is neither good nor bad, it is just part of the picture when evaluating the worth of a particular coin. Does it have eye appeal and how does it grade is the real question. That’s what will be important if you ever wanted to sell.
    IMHO Balboa you attached has been ‘enhanced’ and the patina you are pointing to is the result of for want of a better word cleaning, as a grade it’s not that great but would I buy it? If the price was right most certainly. Would I clean it? Never, I don’t have the skill required to make it look any better than it all ready does.
    As far as patina, original original toning will make or break a high value coin and it can’t be re created. AKA don’t fuk with it.

    Rainbow toning is exciting an can come natural as per Chips post, I’ve got a couple of kooks doing it and a Perth Mint calendar that’s mind blowing but I think you are right, a lot of the ASE you see are forced to tone.

    Out of interest can you post a pic of the yellow patina you speak of? I might have a roo right up your alley ;)
     
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  15. kilo

    kilo Well-Known Member Silver Stacker

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    @Golden ChipMunk, yep it’s way slow I was going to say “show in 10 years” but then wondered if we would all still be here :D
     
  16. kilo

    kilo Well-Known Member Silver Stacker

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  17. Jason1

    Jason1 Well-Known Member

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    wow if it keeps going rainbow and expands, that will be a nice looking coin, likely increase its value if its appealing.
    Toner collectors buy on their personal likes and usually pay accordingly.
     
  18. Golden ChipMunk

    Golden ChipMunk Well-Known Member

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  19. kilo

    kilo Well-Known Member Silver Stacker

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    Got it one Chip, serial number is stamped on the rim, came with a desk stand as well. This one is 1991 all natural, no enhancement required :)
     
  20. kilo

    kilo Well-Known Member Silver Stacker

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    Hey thanks for the link! Just had a look.... great resource material
     

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