What causes this type of toning?

Discussion in 'US Coins Forum' started by TylerH, Dec 7, 2018.

  1. TylerH

    TylerH Well-Known Member

    I found this in a cull bag and in the bag it just looked like gross black tone, but fortunately I took it out and when it was in the light it showed all this rainbow coloring. Got me wondering what caused this as (and I’m new) I usually see black OR color toning, not both. (It’s a 64D ... obverse is normal.. nice but zero tone)

    Thank you!

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  3. green18

    green18 Sweet on Commemorative Coins Supporter

    Terminal state with room for redemption.......
  4. green18

    green18 Sweet on Commemorative Coins Supporter

    I'd soak it in some acetone, rinse it with distilled water, place it upright to allow it to dry, and then put it a plastic baggy, with all of the air squeezed out, to preserve it.......
  5. Michael K

    Michael K Well-Known Member

    Check for the Type C reverse. As for the toning, IDK but I would guess some type of gas.
    64 types.png
  6. ldhair

    ldhair Clean Supporter

    Many dark coins have color that's tough to see. The lighting and angle bring out any color that is there.
  7. ksparrow

    ksparrow Coin Hoarder

    The colors look right for some late stage toning; probably exposed to moisture, heat, some source of sulphur fumes.
  8. TylerH

    TylerH Well-Known Member

    So is the black bad, or just fine / ugly?
  9. Collecting Nut

    Collecting Nut Borderline Hoarder

    I'd leave as is. Lots of collectors like that type of toning.
  10. GDJMSP

    GDJMSP Numismatist Moderator

    What causes this type of toning?

    Simple answer, luster and its interaction with the environment. In other words the same thing that causes any and all toning.
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