Clean the coins

Discussion in 'Conservation & Restoration' started by Tristezza, Mar 24, 2019.

  1. Tristezza

    Tristezza AKA Sectarian

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    Someone can tell me how to clean very very old coins.
     
  2. SuchMuch

    SuchMuch Administrator Staff Member

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    Do not clean them, just concervate, check thread: "Difference Between "Conservation" and "Restoration"".
    Later you can mechanically remove (with the help of microscope and scrapers) all parts those stain coin(s).
     
  3. Lesnik

    Lesnik AKA Novice

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    There are various methods of cleaning coins. But you must have good knowledge of chemistry and etc. Otherwise you can reduce coins value. For starters you might try cleaning coins of low value.
     
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  4. TS
    TS
    Tristezza

    Tristezza AKA Sectarian

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    try to give me advice
    the recent coins are rather easy to clean ..... they are not cleaned ... but some are illegible, they are very encrusted
     
  5. SuchMuch

    SuchMuch Administrator Staff Member

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    Soak coins in distilled water, then completely dry them and only then soak them in solution with Paraloid B-72
     
  6. Ethane

    Ethane Dutch Throll

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    Depending on what material and what patina is on it... If you have copper with the green correlly stuff I clean them very well till I have very shiny copper color... Than I handle them with my own patina conservation, can't give the ingredients sorry. It's my own paste that a few metal detecting shops are distributing. Green patina will eat coin further if you don't handle it. If it's dark patina that is very soft and only that keeps the letters etc visible I take a pan and melt white candles (100 degrees), throw the coins in till they stopped browsing (than all water is completely out) take em out and dry them very softly.

    Silver depending on what patina is on it as well.. if it's very thick corrosion I'll throw them a night in the citrus acid powder blended with boiled water and a little heartburn powder (kind of soda). After drying I handle them with cosmoloid h80. If silver comes out clean enough I'll just use distilled water to soak and after drying I'll dip em in the cosmoloid. If you don't have cosmoloid or whatever you can just use acid free vaseline.

    GOld I just soak in distilled water and let them dry. If gold is from very mineralised ground and it's green as hell I'll throw it in the hydrochloric acid.
     
  7. pasadete

    pasadete AKA Veteran

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    This works, 24h in distilled water :Yes:
     
  8. SuchMuch

    SuchMuch Administrator Staff Member

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    Never go the way Ethane told, I'll write why you should not go that way tomorrow
    --- Double Post Merged, Mar 25, 2019, Original Post Date: Mar 25, 2019 ---
    It helps to remove salts, but it's just a half of the way
     
  9. Ethane

    Ethane Dutch Throll

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    Well, im curious :). On forehand I disagree the post :D.
     
  10. SuchMuch

    SuchMuch Administrator Staff Member

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    Well, I have found those threads woth to read on:
    --- Double Post Merged, Mar 25, 2019, Original Post Date: Mar 25, 2019 ---
    Do not remove patina! By removing patina you won't stop bronze desease if it's present but you will damage existing coin relief easely. There are lots of cases when bronze desease is present with no signs. So, once object is desalted it's a could practice to get any coin be soaked in 3%-5% benzotriazol solution under vacuum for 24-48 hours. Benzotriazol stops bronze desease if any. Vacuum is needed to let benzotriazol penetrates to the very metal core of a coin. Then dry coin and only then get it covered with paraloid.

    Do not use wax. If you do not desalt object and bronze desease is not stopped, by adding wax you will seal bronze desease inside object and bronze desease will never stop.

    PS.
    Benzotriazol is a poison until it's dissolved into spirit (isopropanal). Once it's dissolved it's still harmful for people.
    --- Double Post Merged, Mar 25, 2019 ---
    Once coin is covered with paraloid, all patina is fixed and prevented from crumbling.

    And the final step is mecanical cleaning with the help of different scrubbers under microscope.
    mik10.jpg schaber.jpg
     
  11. pasadete

    pasadete AKA Veteran

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    very valuable has to be the coin to do all this process
     
  12. TS
    TS
    Tristezza

    Tristezza AKA Sectarian

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    very interesting. I reread it carefully this evening
     
  13. Ethane

    Ethane Dutch Throll

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    Depending on the material, acid neutralise salts as well. For iron cannonballs or that kind of things I always use acids to get rid of the salts, but it's a long process. Takes at least 12 months in a bath.

    Boiling coins after desalting is same idea as vacuum them. I'll just boil them in microcrystalline of candle wax. The wax penetrates in to the coin and you are sure all water is fully out. And the process is very easy to reverse. The ability to reverse the conservation steps is almost as important as desalting.
     
  14. SuchMuch

    SuchMuch Administrator Staff Member

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    In case of copper/bronze and their alloys never use acid. I would not use acid in case of old iron too...

    No! It's not an easy task to get rid of wax that filled small pores inside coin. Even with special equipment (steam generator) it's not an easy task.
     
  15. Ethane

    Ethane Dutch Throll

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    No copper you should never threat with acid.. than you better can throw it directly into the garbage can. Saves you some time haha..

    For Iron I use caustic soda and some other blended in products. I'm not sure if it's the right English naming for it. For derusting I use oxalic acid etc.
     
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  16. Ethane

    Ethane Dutch Throll

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    If you dont desalt a canon ball,this will happen xD

    IMG-20190325-WA0001.jpg

    IMG-20190325-WA0002.jpg
     
  17. pasadete

    pasadete AKA Veteran

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    Iron cancer
    --- Double Post Merged, Mar 27, 2019, Original Post Date: Mar 27, 2019 ---
    a way to stop iron cancer is to heat the piece to red hot and let it cool, the part affected by the cancer will fall off and the good will remain healthy.
     
  18. Ethane

    Ethane Dutch Throll

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    This is due to salt hihi.. maybe if you zoom in you can see all the dry salt cristals. I waited to long, now complete ball is like dust/sand lol
     
  19. pasadete

    pasadete AKA Veteran

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    yep noob :Biggrin:

    potassium or sodium salt, heating red hot stops the process
     
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  20. Ethane

    Ethane Dutch Throll

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    I know, I'm selling my home and before the photographer was coming I thrower it in a corner but forgot it ;). Heat doesn't solve the salt problem ;). Maybe the process but salt ain't going out.

    I use the things that I mentioned above to keep conservation.

    IMG_20190325_173029.jpg
     
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