Found this interesting post on another forum regarding polished coins and how to "dull them up". Involves a tin box, rocks, acetone, and some odd coins: Quote: "I have this tin that has been my "coup 'd gras" for years. It takes a bit to get it conditioned right but once done...magic. Take an English peppermint tin and remove any interior clear coating by a rinse with acetone or lacquer thinner soak. Use gravel to shake and "open up" the interior surfaces. Remove gravel. Add a variety of coins composed of dis-similar metals. (Foreign,silver,brass, aluminum,copper etc...) Shake well and frequently. Place coin in tin. Making up this tin creates a place where a natural electrolysis takes place and develops a white powder. This "powder" is from all the dis-similar metals actually transferring surface molecules from coin to coin, tin to coin etc.. This "Magic Powder" is very aggressive to minutely resurface any "polish" away. Making up this tin takes a while to get it active but once done, you'll have it forever. " What are your thoughts?
Nothing magic about it, it's a type of corrosion. There is no way to fix a problem coin, once a problem coin always a problem coin. You might cover up one problem with another problem - but then you've only got a coin with 2 problems instead of 1.
All metals want to return to their original state, even noble metals such as titanium want to break down into sulfides. This corrosion process can be accelerated with electrolysis or acids, or a combination of both. Metals that resist corrosion, like gold and platinum can be moved from one base metal to another in this fashion. The powder this person speaks of is nothing more than a sulfide that has been leached from the various combination of metals, and has no properties to magically cure another coin...wishful thinking.
