2012年6月10日 · To the Seated half dimes 1/2 Dino(left), Dinero to the Sol coins. 900 silver coins for ½ and 1 dinero and 1⁄5 sol were introduced, followed by .900 silver ½ and 1 sol in 1864. Later the Un Sol (Pictured) was reduced to just 50% Silver SPAIN & KINGDOM 50 CENTIMOS .835 Silver 1904,1910,1926, 1 PESETA .835 Silver 1901,1902,1903-1905

2009年12月22日 · Silver sulfide is an example, copper oxide is an example, rust (ferrous oxide) is another example. Some metals react much more readily; for example, copper is far more reactive than silver. Because of this higher reactivity, the chemical processes in the thin films which form on the surface of copper coins are far more complicated - although ...

2020年6月20日 · back to silver gaming tokens. i bought three binion ten dollar gaming tokens, about ten years ago, i paid between $30 to $45 dollars! binion tokens and silver coins were very popular, i have binion certerfied silver coins. lonnie ted binion built possibly the greatest silver collection out of his cosinos. look him up!

2010年12月11日 · To convert from grams to troy ounces I used the conversion factor of 0.0322, then multiplied the troy ounce weight by 0.90 since they are 90% silver coins. So I got these silver content values per coin. Calculated Silver Content per Coin: - 1 Kennedy (EF/AU) contains 0.3631 troy ounces of silver (on average)

2016年4月3日 · There is no average coin shop, and what shops pay depends on what form the silver is in. Grandma's silverware is going to get a different price from vintage rounds/bars or ASEs or low grade 90% silver coins. Unless there's some additional collectible value, any shop is going to pay a little back of spot and sell for a little premium over spot.

2019年2月6日 · Indeed. That 1871-1914 period was the high point of the global gold standard, but silver seems to have been pretty universal for smaller-denomination coins that most people used in everyday life. In the U.S., direct lobbying by silver miners was a big factor in the decision to issue silver coinage.

2018年6月29日 · With reference to the 1914 BWA coin, I have seen this type of coloring on silver coins that have been cleaned/polished and have then re-toned after the procedure. On the obverse behind the king's head, there appear to be polishing hairlines from rubbing, about 15 degrees off the vertical, and if this coin was to be dipped, these hairlines would ...

2016年1月6日 · Try it with crap coins first of various compositions and check em with a loupe after. I think some people put a velvety type material on 5he bottom of the basket just in case Cascade , Jan 6, 2016

2013年2月11日 · The silver must be in physical contact with the aluminum (although technically you can chain the silver contacts). The electrochemical activity will reverse the effect of tarnish but as noted will not remove grime etc. It could be argued that it's not a cleaning, technically speaking. However, the results on old, soiled coins will be irregular.

2016年12月26日 · OP, the good news is that it looks like these coins aren't super valuable collectible coins. The bad news is that baking soda and aluminum foil cause an electrochemical reaction on the silver. It has stripped any protective oxide/sulfide layer from the coins, so they may tone significantly in the near future.