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Cleaning
ancient coins
Cleaning ancient coins
using the distilled water and olive oil method.
INTRODUCTION
The first step in cleaning ancient
coins is to acquire some. Ancient coins are those older than medieval times and
some of the most plentiful are from the Byzantine Empire. Uncleaned coins can
be purchased singly or in lots of ten to a thousand or more. For your first
venture into this form of treasure hunting, it would be wise to start small
with ten or twenty coins. Expect to pay about a dollar each for these bits of
antiquity. Also expect them to be mostly small and made of bronze. Most
uncleaned coins offered for sale will have been gone over with a metal detector
to winnow-out the gold and silver ones. Don’t let this deter you, however, as a
lot of the fun of this hobby is scrapping off centuries of dirt and corrosion
to catch a glimpse of a laureate profile or Latin inscription.
When your coins arrive, they will be
more or less disc-shaped and may sound metallic when jiggled. They will be
covered with dirt or worse. Your task will be to clean them enough to see if
you have attributable coins or worn slugs of ancient metal. If you are already
familiar with collections of modern coins be prepared to lower your standards
considerably. Perfect, uncirculated ancient coins are very rare and unlikely to
turn up in odd lots of uncleaned coins. The standards applied to ancient coins
make allowances for the centuries they have been in existence, squirreled away
in usually damp and dirty hiding places.
Any coin that still shows traces of
its original stamped image will probably grade poor to fair. Coins that have
recognizable images and inscriptions will be good to very good to fine or very
fine. Do not be discouraged if you find coins that have images that are
off-center, contain holes, or show signs of having pieces sawn off. Remember
that ancient coins were hand-made using blank discs of metal and special mint
dies. A blank was placed on the bottom of the die, covered with the top die and
stuck sharply with a hand-held mallet. Less skillful workers would produce
sloppy coins. Large denomination coins were sometimes cut into smaller pieces
to make change and coinage was often altered by succeeding regimes by piercing
or re-striking. It was not uncommon for ancient people to make a small cut in a
coin to make sure it was solid and not just plated with precious metal. There
are collectors that specialize in altered coins. Don’t throw anything away just
because it looks less than perfect.
GETTING STARTED
Before you start cleaning your coins
you will want to assemble a few tools and some chemicals.
Tools : A good source of light is essential. Craft shops sell
magnifying lights that are very useful, especially if you do not have a stereo
microscope. Empty baby food jars are very handy for holding liquids and soaking
coins. You will need an old toothbrush for scrubbing the coins, toothpicks or
dried rose thorns for picking out bits of dirt, and cotton swabs for working on
small areas of a coin. Remember that ancient coins are fairly soft metal either
bronze, copper, silver, or gold. You do not want to scratch the surface of the
coin while cleaning it nor do you want to remove any patina that may have built
up over the centuries. Your object is NOT to reduce your coins to shiny
like-new condition.
Chemicals: Most of the dirt on your coins will yield to soaks in
distilled water or olive oil. Do not use tap water, the chemicals in tap water
can harm your coins and destroy any traces of patina that may remain. More
encrusted coins will clean up after soaking in olive oil. Use the least
expensive oil, not extra virgin. Very persistent dirt can be removed with WD40
and a combination of baking soda and vinegar. These last two should be used
only as a last resort as they can change the color of the patina. Vinegar and
baking soda can also worsen pitting on already-pitted coin surfaces.
THE CLEANING PROCESS
Sort your coins before you start
cleaning them. If you are very fortunate, you will have some that will need
very little cleaning to be recognizable. Keep these coins in a separate jar as
they will not need much work. If you only have a few coins, put them in a small
dish or baby food jar and cover with distilled water. Allow them to soak for an
hour or so then pull one out and rub it with your fingers to see if the dirt is
softened enough to remove. If your fingers get soiled, use the toothbrush to
scrub away at the surface.
Do this with all the coins, one at a
time, rinsing each one in more distilled water and drying carefully with paper
towels. Examine each coin under magnification, either a hand lens, magnifying
light, or stereo microscope. Some of your coins might be pretty clean just from
the water soak. If they are still encrusted with dirt, a longer soaking, over
night or for several days, in fresh distilled water might do the trick. Repeat
the soaking, scrubbing, rinsing, and drying a second time.
Coins that are still encrusted with
dirt and corrosion should now be put in olive oil. Use a container that has a
tightly fitting lid so that you don’t spill the oil accidentally. Dirty olive
oil is very messy to clean up. Let your coins soak in the oil for a day or
more. You can pull them out, brush them with the toothbrush and blot with paper
towels, and examine them under magnification. As the dirt comes off, remove the
clean coins from the oil but return the still-dirty ones for more soaking.
As the dirt and corrosion comes off
the coins you should be able to see images and inscriptions. If, as you work
your way through the cleaning process, you can’t see anything you may have to
accept that you have a worn-out slug, a coin that has been through many hands and
all the images are rubbed smooth. Fifty years of constant circulation is enough
to remove most vestiges of relief from a coin.
Patina is not present on all coins.
It is a coating that develops on metal after many years of use. It can be
greenish, brownish, or grayish in color and many collectors consider it one of
the beauties of ancient coins. A coin with excellent patina can be forgiven a
slightly worn image, for instance. NEVER do anything to a coin that will remove
the patina or change its original color.
Coins that show good images, patina,
and some inscription are worth a more careful examination under magnification.
Here is where you will want to start picking with a toothpick or dead rose
thorn. Work carefully under magnification and try to dislodge bits of corrosion
from between letters and around details. If you have a hot glue gun, plug it in
and drop a glob of glue on the coin. When it hardens, lift the glue off and a
lot of dirt will go with it.
METHODS TO AVOID
Do not be tempted to use metal
brushes, rock tumblers, dremel tools, or ultrasonic cleaners. All of these
methods will result in smooth, shiny, metal slugs, NOT attributable coins. Also
avoid the use of harsh chemicals. Experts make use of formic acid, sulfuric
acid, and silver nitrate but in the hands of a beginner these chemicals can
ruin coins and cause injury.
IDENTIFYING YOUR COINS
If you are very fortunate and
discover a coin in very good or fine condition you will want to identify it if
at all possible. There are many books available to help in the attribution
process or you can take your treasure to an antiquarian for assessment. Some
will do this for free others will expect a fee and some might even be
interested in buying your find.
Coins of little or no value to a
serious collector are still interesting and can be used to make intriguing
pieces of jewelry. Craft shops sell bezels for enclosing coins to make
pendents, broaches, or charms. Coins can also be mounted and framed for
display.
Whether you find a valuable coin or
not, the enjoyment of handling real money that ancient people used in their
daily commerce is a big part of cleaning coins. You may develop a deeper
interest in the history of Rome and ancient Greece and collecting the coinage
of those ancient civilizations is like traveling back in time.
If you have a question or concern:
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