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<p>[QUOTE="dougsmit, post: 676523, member: 19463"]I suspect this number is about right but you have to allow for the fact that 70% of the coins found will not be cleanable even using 'correct' techniques. Being buried in dirt for a thousand years can have a negative effect but being buried for a few years in a field that was treated with chemical fertilizers can be worse. Ancient coins that are found get sorted and sold according to the likelihood of something worthwhile coming out of the dirt. The ones amateurs like me get were not considered worth sending to the professional cleaners. Most dealers know that there are more people willing to buy a silver coin that is silver in color than grey/black so many coins are cleaned more than I might have preferred. </p><p> </p><p>Modern collectors expect their modern coins to have spent their lives in a bank vault. Ancients that are lucky come from a pot or chest that was buried rather than lost individually in the soil. Sometimes the hoard will be fused together into a lump and the coins in the center of the lump will be pristine compared to individual field finds from an open field. If 30% of the coins found are being cleaned in such a way that they look good, we are doing pretty well. I probably 'ruin' over 70% of the coins I clean if we define 'ruin' as make a mark I wish I had not made. On the other hand, if I start with a featureless lump and end up with a readable and attractive coin, so be it. I'd rather have a lightly scratched coin (all of the coins in my coin purse are scratched) than a featureless lump of soil and mineral deposits.[/QUOTE]</p><p><br /></p>
[QUOTE="dougsmit, post: 676523, member: 19463"]I suspect this number is about right but you have to allow for the fact that 70% of the coins found will not be cleanable even using 'correct' techniques. Being buried in dirt for a thousand years can have a negative effect but being buried for a few years in a field that was treated with chemical fertilizers can be worse. Ancient coins that are found get sorted and sold according to the likelihood of something worthwhile coming out of the dirt. The ones amateurs like me get were not considered worth sending to the professional cleaners. Most dealers know that there are more people willing to buy a silver coin that is silver in color than grey/black so many coins are cleaned more than I might have preferred. Modern collectors expect their modern coins to have spent their lives in a bank vault. Ancients that are lucky come from a pot or chest that was buried rather than lost individually in the soil. Sometimes the hoard will be fused together into a lump and the coins in the center of the lump will be pristine compared to individual field finds from an open field. If 30% of the coins found are being cleaned in such a way that they look good, we are doing pretty well. I probably 'ruin' over 70% of the coins I clean if we define 'ruin' as make a mark I wish I had not made. On the other hand, if I start with a featureless lump and end up with a readable and attractive coin, so be it. I'd rather have a lightly scratched coin (all of the coins in my coin purse are scratched) than a featureless lump of soil and mineral deposits.[/QUOTE]
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