Home U.S. Coin Forum

Stained permanently?

DollarAfterDollarDollarAfterDollar Posts: 3,214 ✭✭✭✭✭
edited January 10, 2023 5:42PM in U.S. Coin Forum

Help me out here. I bought a nice PL Morgan at auction that appeared to have grey grease on the reverse. I thought, no big deal. It's not grease. I tried acetone, acetone/MS 70 and I boiled the coin for 30 minutes. Nothing is removing this stain.
I'm thinking Methyl Ethyl Ketone or Alcohol but I don't know if those might hurt the luster. Any ideas. This substance is definitely "on" the coin.

If you do what you always did, you get what you always got.

Comments

  • lkeneficlkenefic Posts: 7,816 ✭✭✭✭✭

    Acetone is already more aggressive than alcohol.. MEK is about as strong as it gets... good luck and be safe!

    Collecting: Dansco 7070; Middle Date Large Cents (VF-AU); Box of 20;

    Successful BST transactions with: SilverEagles92; Ahrensdad; Smitty; GregHansen; Lablade; Mercury10c; copperflopper; whatsup; KISHU1; scrapman1077, crispy, canadanz, smallchange, robkool, Mission16, ranshdow, ibzman350, Fallguy, Collectorcoins, SurfinxHI, jwitten, Walkerguy21D, dsessom.
  • gtstanggtstang Posts: 1,692 ✭✭✭✭✭

    The surface under there may already be affected and if removed would look grey and flat and very noticeable.

  • gumby1234gumby1234 Posts: 5,425 ✭✭✭✭✭

    How long did you leave it in the acetone?

    Successful BST with ad4400, Kccoin, lablover, pointfivezero, koynekwest, jwitten, coin22lover, HalfDimeDude, erwindoc, jyzskowsi, COINS MAKE CENTS, AlanSki, BryceM

  • logger7logger7 Posts: 8,069 ✭✭✭✭✭

    Doubtful there is any remedy after what you already used.

  • DelawareDoonsDelawareDoons Posts: 3,241 ✭✭✭✭✭
    edited January 10, 2023 7:36PM

    Yeah that looks done for. Unfortunate.

    Professional Numismatist. "It's like God, Family, Country, except Sticker, Plastic, Coin."

  • rickoricko Posts: 98,724 ✭✭✭✭✭

    @DollarAfterDollar ... There may be damage to the surface of the coin beneath that substance. Be careful with further efforts, since stronger solutions may damage luster (if any is there). Can you remove any with a rose thorn?? Or is it resistant to manual force as well? Cheers, RickO

  • DollarAfterDollarDollarAfterDollar Posts: 3,214 ✭✭✭✭✭

    @gumby1234 said:
    How long did you leave it in the acetone?

    Only about 30 minutes. Today I'll give it a long bath.

    If you do what you always did, you get what you always got.
  • Bigbuck1975Bigbuck1975 Posts: 1,249 ✭✭✭✭✭

    @DollarAfterDollar said:

    @gumby1234 said:
    How long did you leave it in the acetone?

    Only about 30 minutes. Today I'll give it a long bath.

    Leave it in a sealed container for days.

  • Jzyskowski1Jzyskowski1 Posts: 6,651 ✭✭✭✭✭
    edited January 11, 2023 8:41AM

    Did you pick at it with a rose thorn?
    As @ricko suggests. Agree with @gumby1234 that the surface may hold an unpleasant surprise once it’s off there. 🧐

    🎶 shout shout, let it all out 🎶

  • gumby1234gumby1234 Posts: 5,425 ✭✭✭✭✭

    Yes try a long acetone soak. It just might work. rinse and gently pat dry so as not to scratch it.

    Successful BST with ad4400, Kccoin, lablover, pointfivezero, koynekwest, jwitten, coin22lover, HalfDimeDude, erwindoc, jyzskowsi, COINS MAKE CENTS, AlanSki, BryceM

  • BryceMBryceM Posts: 11,729 ✭✭✭✭✭

    I think you’ll likely need some mechanical effort to remove that. It’s also likely that you’ll either cause some unintended damage or uncover something you don’t like.

  • Namvet69Namvet69 Posts: 8,670 ✭✭✭✭✭

    Might not be a grease stain, just saying.

    BST: endeavor1967, synchr, kliao, Outhaul, Donttellthewife, U1Chicago, ajaan, mCarney1173, SurfinHi, MWallace, Sandman70gt, mustanggt, Pittstate03, Lazybones, Walkerguy21D, coinandcurrency242 , thebigeng, Collectorcoins, JimTyler, USMarine6, Elkevvo, Coll3ctor, Yorkshireman, CUKevin, ranshdow, CoinHunter4, bennybravo, Centsearcher, braddick, Windycity, ZoidMeister, mirabela, JJM, RichURich, Bullsitter, jmski52, LukeMarshall

  • yosclimberyosclimber Posts: 4,593 ✭✭✭✭✭
    edited January 11, 2023 4:15PM

    Looks like a foreign substance, like some kind of glue.
    That is, raised above the surface rather than just a surface discoloration.
    Unfortunately I don't know enough about alternative solvents to know what to try, other than longer in acetone in a sealed jar.

  • SurfinxHISurfinxHI Posts: 2,350 ✭✭✭✭✭

    I wonder what goo-gone would do? I've never tried it, and if anything, I'd go with days and day in acetone as other suggested.

    Dead people tell interesting tales.
  • DollarAfterDollarDollarAfterDollar Posts: 3,214 ✭✭✭✭✭

    Been in acetone about 12 hours. Still no progress. I was wondering about goo gone too. Gotta read the label tomorrow.

    If you do what you always did, you get what you always got.
  • DelawareDoonsDelawareDoons Posts: 3,241 ✭✭✭✭✭

    Goo gone is weaker than acetone.

    If MS70 didn't work it's probably toast. Maybe xylene and a q-tip?

    Professional Numismatist. "It's like God, Family, Country, except Sticker, Plastic, Coin."

Leave a Comment

BoldItalicStrikethroughOrdered listUnordered list
Emoji
Image
Align leftAlign centerAlign rightToggle HTML viewToggle full pageToggle lights
Drop image/file