Unfortunately not all coins sold are correctly marked so buyers must be in their fingers. One type of cleaning include what is referred to as "immersion". Immersion include dry cleaning with the result of simple beautiful coin, but with less Luster. Coins, improper passing usually leave a white film on the surface of the coin. One of the best tools I've found for this is to use avid facility. Bluish/white LED light on the loupes or magnifying glasses really brings out white film, for easier detection and makes for easy this claim to the seller, which most likely will reduce its asking price.
The next level of cleaning is much more stringent. Coins or tarnish this is dirt, but the actual silver or copper material when you remove or mollify tarnishing of the coin is removed the actual silver or copper. If tarnish or colour is light then the damage is minimal, but if your serious then the composition of the coin and design changes drastically. Look at this Australian large copper coin, I grabbed for the dollar only for this article. Was purchased at online auction and the picture is reduced so that the could not inspect the coin. Clues that this is a coin is cleaned of its color. Largest copper coins tonne very quickly to the brown or even chocolate part of dark brown colour as such bright copper color signal was that recent cleaning and since the coin is from 1919 was toning down my hunch is quite seriously before cleaning.
After receipt of the coin there was no apparent brush marks on the surface of the coin, confirming suspicions cleaning. After scaling one of the areas of the symbol can be seen the real damage. Surface points with shelling, where the moved material, so that this coin was first chemically treated and then brushed. The other party is not better, it shows the characters of the same brush and downloads. To determine what this shoe is the coin was thrown in the scale. Most large coppers from this period is measured 9.3 to 9.5 grams, but after thorough cleansing, has dropped weight to 9.1 grams, remove anywhere from 2 to 4 grams of copper. So the question at hand is "this is good for collector"?
- The answer is maybe. Material removed is not obvious without increase, but a huge volume of brush marks in the coins are quite dispersed. For me I just search for one example of George v design, and I believe that a little overdue and soothe may reduce the ugliness of brushed fields so that barely squeaks as acceptable figure, but I will annotate it as "highly clean".
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