Cleaning (coinage)

Coin cleaning is the process of removing undesirable substances from a coin's surface in order to make it more attractive to potential buyers. The subject is controversial as no consensus exists among the numismatic community whether cleaning is necessary. Those that argue in favor of cleaning are also in dispute on which methods work best. It was once common practice to clean coins as the method was recommended by experts in the field. Solutions from pencil erasers to wire brushes and potassium cyanide were all used as cleaning agents with the goal to make the coin look brilliant again. When certified grading came into use in the mid 1980s though, the practice of cleaning coins diminished over time. Most coin experts have since come out against cleaning coins, as doing so can negatively effect them both in grade and value. If a potentially valuable coin must be cleaned then professional work is recommended. Commonly found coins are mentioned as ideal candidates for any attempted cleaning experiments.

This article is about cleaning coins to improve their appeal. It is not to be confused with cleaning coins of germs, or other health related issues.
An improperly cleaned Indian Head cent, note the wear present under the "brilliant red" surface.

History

Coin cleaning has no definitive start date as when any object looks dirty people are usually inclined to clean it. The cleaning of coins though can be traced as far back as the mid 1800s in the United States when it came to Half cents and large cents. These coins soon became popular with collectors after they were discontinued in 1857 due to the rising costs of copper. Cleansers were used on the cents to try and make the coins mint red again.[1] Another early example involves the Philadelphia coin cabinet. In 1903, many coins in the collection that had once been in proof condition were now partly covered in a white coating. An investigation found that the coins in the cabinet (displayed in the Philadelphia Mint since 1838) had at some point been cleaned by an attendant using purchased metal polish, as the coins were "tarnished". The cabinet today resides in the Smithsonian.[2]

By the 1930s the motto "brilliant is best" was adopted by those in the coin collecting community. Coins that were toned were considered tarnished which caused collectors to brighten up their coins with things like abrasives.[2] Penny boards were even made with instructions on how collectors should properly clean their coins by using a pencil eraser with a little bit of vinegar. The widespread practice of "improving" coins continued into the 1960s with advertisements on lotions and potions with the aim of making coins brilliant again.[3] According to Q. David Bowers, collectors and coin dealers cleaned and dipped their coins then re-dipped them when the toning re-appeared as a result of these messages.[3] Bowers estimated in 1960 that 90 to 95% of the Lincoln cents sold in the marketplace dated 1910 through the late 1920s were brilliant as a result of dipping.[4] Coins that were cleaned also include the Indian Head cent, starting in the 1960s many now scarce dates were whizzed (see below) which later destroyed them of value.[5] The widespread practice of coin cleaning lasted until the invention of certified and encapsulated grading in the early 1980s. When coins were finally viewed under the microscope and trained naked eye, the effects of treating coins were revealed to be less than ideal.[1][6] Poorly cleaned coins are now labeled "Improperly Cleaned", which affect their market value depending on severity.

Professional stance

Numerous known numismatists have given their opinions over the decades regarding coin cleaning. William H. Sheldon (creator of the Sheldon coin grading scale) wrote an opinion on cleaning old pennies stating: "Many a cent has been ruined in an attempt to improve it. Amateurs, and some who are not so amateur, are forever trying to improve the condition or appearance of an old cent." Richard Snow who specializes in the field of Flying Eagle and Indian Head cents, wrote that some cleaning techniques can improve the surface of a coin. Snow does not suggest that people try these remedies but gives an "indication" on what could be done. He goes on to recommend in all instances that experiments be done on cheap bronze Lincoln cents (minted 1962 to 1982), and not valuable older coins.[7] Scott A. Travers, author of the book The Insider's Guide to Coins Values states that a coin should never be cleaned as "many" collectors find them to be "repugnant". Travers also wrote that the idea of enhancing a coin's value through cleaning is a misconception.[8] Kenneth Bressett and A. Kosoff also wrote opinions on the matter saying that once a coin has been "stripped" of its original surface and luster, it can "never be fully restored or made Uncirculated again".[9] John J. Ford Jr. wrote an opinion regarding expertly cleaned coins saying that "while the result makes the coin look untouched, attractively colored coins should be left alone".[10]

Methods

Listed below are some examples of how coins are cleaned. Coins with untouched original surfaces are generally more desirable than those that have been cleaned, although lightly cleaned coins with no damage done may still receive a normal coin grade. Improper cleaning can result in a coin's surface being damaged beyond repair, which is why expert attention is needed for potentially valuable coins.[11][12] If a coin is shown to be damaged by cleaning then it will be marked as "Improperly Cleaned" or have a problem description by grading services.[13][14]

Method Description
Abrasives Baking soda, scouring powder, and pencil erasers all cause damage to coins.[12] Brushing a coin with a toothbrush or a brush with soft fibers can create minute scratches on the surface of a coin.[15] These scratches, known as "hairlines" may impact the grade of the coin depending on the severity.[14]
Burnished/
Polishing		 Aggressive cleaning which gives the coin a "very brilliant but unnatural sheen". These coins are graded with a description which lowers the coin's value.[14][16]
Cloth These coins are gently rubbed with a cloth which create "surface hairlines". Even though some original surface remains underneath, the coin's grade may be impacted depending on the severity.[14]
Dipping The coin is dipped into a dilute acid solution that removes the oxidation from the coin along with a small amount of metal. Overdipped coins result in loss of luster which lowers the coin's grade and appeal.[12][9]
Ivory soap and Water According to author Thomas E. Hudgeons Jr., this is the safest way commonly found coins are cleaned.[12] Distilled water is recommended as tap water contains chlorine.[17]
Olive oil The coin is dipped into olive oil which according to Hudgeons, works best for common copper or bronze coins.[12]
Potassium cyanide This solution was commonly used as a coin cleanser in the 1920s, it led to the accidental death of a prominent numismatist at the time.[18]
Ultrasonic Cleaners These coins are cleaned by using distilled water with a small amount of detergent in a special vibrating container.[12] Acid based cleaners will eat away at a coin's surface diminishing its value.[19]
Vinegar and salt According to research professor Vinod Patel, washing coins with natural white vinegar and iodized salt in distilled water is a non destructive way of cleaning coins.[20]
Whizzing These coins are "cleaned" by means of a fast rotary wire brush which damages the surface.[9][14]

Shipwreck finds

All items involved in shipwreck finds are documented and photographed in their before and after state to study any changes made by the restoration process.[21] The cleaning process involves desalination in order to remove harmful salts that include chlorides. In the case of the Sveti Pavao shipwreck, the items involved were isolated in a polypropylene net and placed in tap water.[21] The tap water was then exchanged and monitored until it was finally replaced by distilled water towards the end of the process.[21] The items involved are then dried, and cleaned differently depending on the base metal of the object.[21] Sea water is very corrosive and destructive to silver coins, their value is determined by their original condition as raised and by the conservation process. Gold coins on the other hand survive better underwater making their conservation process easier.[22]

All coins recovered from shipwrecks likely hold an appeal as historical artifacts and can be given the status of "treasure" which is marketable.[22] These coins have an added value only if they are determined to be genuine, as a majority of collectors do not want to own an illegal coin subject to seizure.[23] The largest supply of American mint state gold coins have been recovered from shipwrecks in grades previously unknown to collectors.[24]

See also

References
  1. David W. Lange (October 11, 2011). "USA Coin Album: Cleaned Copper May Be Challenging to Detect". NGC. Retrieved March 6, 2018.
  2. Q. David Bowers. A Guide Book of Lincoln Cents 2nd Edition. Whitman. p. 107.
  3. Q. David Bowers. A Guide Book of Lincoln Cents 2nd Edition. Whitman. p. 109.
  4. Q. David Bowers. A Guide Book of Lincoln Cents 2nd Edition. Whitman. p. 110.
  5. Richard Snow. A Guide Book of Flying Eagle and Indian Head Cents. Whitman. pp. 97, 100, 103.
  6. James F. Ruddy. Photograde: Official Photographic Grading Guide for United States Coins. Zyrus Press. p. 241.
  7. Richard Snow. A Guide Book of Flying Eagle and Indian Head Cents. Whitman. p. 44.
  8. Scott A. Travers (2008). The Insider's Guide to Coins Values 2009. Random House Publishing Group. p. 24. Retrieved August 25, 2017. cleaned coins.
  9. Ken Bressett and A. Kosoff. Official A.N.A. Grading Standards for United States Coins Fifth Edition. American Numismatic Association. pp. 34, 180, 185.
  10. James F. Ruddy. Photograde: Official Photographic Grading Guide for United States Coins. Zyrus Press. pp. 241–244. Retrieved August 25, 2017.
  11. Alan Herbert. "How to Handle & Clean Your Coins". www.numismaster.com. Retrieved August 25, 2017.
  12. Thomas E. Hudgeons Jr. The Official Blackbook Price Guide to United States Coins 2014, 52nd Edition. Diversified Publishing. Retrieved August 25, 2017.
  13. Charles F. French (2002). 2003 American Guide to U.S. Coins. Simon and Schuster. p. 19. Retrieved August 25, 2017. Coin cleaning.
  14. "NGC Details Grading". Numismatic Guaranty Corporation. Retrieved August 28, 2017.
  15. Nick A. "Silver Coins, Cleaning and Condition". www.ohiometaldetecting.com. Retrieved February 1, 2019.
  16. Howard Linecar (1985). Coins and Coin Collecting. Hamlyn. p. 16.
  17. Alan Herbert (September 15, 2010). Warman's U.S. Coin Collecting. F+W Media, Inc. Retrieved February 1, 2019.
  18. Robert R. Van Ryzin (September 12, 2007). "Drinking and coin cleaning a deadly mix". www.numismaticnews.net. Retrieved March 5, 2018.
  19. David C. Harper, Harry Miller (July 20, 2011). 2012 North American Coins & Prices. F+W Media, Inc. Retrieved February 1, 2019.
  20. Richard Giedroyc (November 9, 2015). "Science shows how dirty coins, currency can get". www.numismaticnews.net. Retrieved March 15, 2019.
  21. Carlo Beltrame, Sauro Gelichi, Igor Miholjek (2014). Sveti Pavao Shipwreck: A 16th century Venetian merchantman from Mljet, Croatia. Oxbow Books. p. 162.CS1 maint: multiple names: authors list (link)
  22. Debbie Bradley (July 21, 2008). "Shipwreck treasure has experts speculating". Numismatic News. Retrieved December 15, 2019.
  23. Marjorie H. Akin, James C. Bard, Kevin Akin (2016). Numismatic Archaeology of North America: A Field Guide. Routledge. p. 191.CS1 maint: multiple names: authors list (link)
  24. Heritage Capital Corporation (2004). "Heritage Numismatic Auctions Presents Chouinard Collection Catalog #360". Ivy Press. p. 20.
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