It sounds like you're looking for the equivalent of Nic-A-Date, an acid that's used to bring up the dates on worn buffalo nickels. However, silver is a much softer metal than nickel and to the best of my knowledge there is no similar product that can be used on silver coins because it would melt too much of the surrounding metal.
In any case coins that have been treated with Nic-A-Date are considered to be damaged so they don't gain any collector value. Dateless coins are effectively "culls" that are worth either their face value or their precious metal content, whichever is higher, but they have no extra value to collectors.
In that there are no copper or silver niclle coins the question has no purpose. Copper and silver coins can be distinguished from each other by chemical reactivity, density, appearance (colour), electrical conductivity, mint mars and dates and a numismatic data book.
If the coin is a valuable coin you shouldn't use anything acid or cleaner on it you will devalue the coin
Depending on what country issued the coins, you have to know its denomination and date. There are reference books (e.g. the Red Book for US coins, the Krause guide for world coins) that tell you which dates and denominations to look for.The rules for US coins are fairly straightforward:> Dimes, quarters, and halves dated 1964 or earlier are 90% silver, 10% copper.> Dollars dated 1935 and earlier are 90% silver.> Half dollars dated 1965-70 are 40% silver> Nickels dated 1942-1945 AND with a large mint mark over the dome are 35% silver.> Half dimes and some 3 cent pieces (both obsolete denominations) are silver.If you have anything else among modern coins, it does notcontain silver regardless of rumors or urban legends to the contrary. For example, there has never been a silver US penny, only steel, and all other nickels except those listed are made of copper-nickel, even the ones dated before 1965.
In WWII, The United States had to use 56% Copper, 35% Silver, and 9% Manganese. The dates for these 35% silver nickels are 1942(P,S) (NOT D), 1943(P,D,S), 1944(P,D,S), and 1945(P,D,S). The mint marks on these coins are located above the dome of Monticello. Contrary to popular misunderstanding, these are the only US nickels that ever contained silver. The rest are all made of an alloy of 25% nickel and 75% copper.
The only US nickels that ever contained silver were the famous "war nickels" minted from mid-1942 to 1945. These coins were struck in an alloy of 35% silver, 56% copper, and 9% manganese because nickel was needed for the war effort.In average condition these coins are worth around $1.00 to $1.50, mostly for their silver content. For more specific values, please see the Related Questions for each date.Other old nickelsMany people assume that because dimes, quarters, and half dollars were made of silver before 1965, nickels were as well. In fact all other dates of nickels are made of an alloy of 75% copper and 25% nickel. If you think about it for a while, a nickel is over twice the size of a dime so if it had been mostly silver it would have been worth much more than a dime, rather than just 5 cents.
In that there are no copper or silver niclle coins the question has no purpose. Copper and silver coins can be distinguished from each other by chemical reactivity, density, appearance (colour), electrical conductivity, mint mars and dates and a numismatic data book.
With those dates, the coins are Silver Eagle bullion coins that are made from one ounce of silver and value is whatever the spot price of silver is at time of sale.
With those dates, the coins are Silver Eagle bullion coins that are made from one ounce of silver and value is whatever the spot price of silver is at time of sale.
Each denomination of US silver coins has different amounts of silver, so it's not possible to answer this question. Be more specific and post new question with the dates of the coins.
With no rare dates they likely are only valued for the silver.
Be more specific, dates are needed.
It depends on the dates, mintmarks and condition of the coins.
If the coin is a valuable coin you shouldn't use anything acid or cleaner on it you will devalue the coin
Denominations and dates are needed, post new question.
First, U.S. coins were never pure silver. The silver American Eagles come the closest at 99.9% pure. As for the circulating coins, they were 90% silver and were last dated 1964 even though mintage of the 1964 dates continued part way into 1965 to counteract hoarding.
It depends how much you have and what type of coins you have. Are they collector coins (as in, high grades, key dates, rare coins) or are they junk silver coins (as in, worn silver quarters from the 40s, silver dimes from the 50s, etc.). If they are collector coins, it is better to sell to a reputable dealer. If they are junk silver coins craigslist and eBay are your friends, but dealers and jewelery stores will usually buy them too. Don't go to places like "Cash 4 Gold" or other "Hotel Lobby" sellers. They will often times take 50% or more off the true value of your coins.
Yes, there are many silver Mexican coins, however, when compared to other countries, Mexico used lower purity silver in their more modern coins and often times different coins had different cut-off dates for silver. For example, until 1918, Mexican Peso coins were made out of 90.3% silver, in 1918 that was reduced to 80% silver, in 1920 it was reduced again to 72% silver, in 1947 it was reduced yet again to 50% silver, in 1950 it was reduced to 30% silver, and in 1957 the coin was only 10% silver until 1970 when it was replaced with a copper-nickel coin containing no silver. Mexico also has many modern bullion coins struck in silver.