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silver sulfide. its an oxidation process.

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12y ago

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What is the chemical name for the black coating on an old coin?

The black coating on an old coin is typically referred to as patina, which is a thin layer of oxidation that forms on the surface of metal over time. It can consist of various compounds depending on the metal composition of the coin, such as copper sulfides or oxides.


What is the chemical name for a green coating on a coin?

For copper or some copper alloys coins the coating is hydrated copper carbonate.


How much is an 1890 UN centavo coin worth?

The price of the coin depends on its condition here a link to a website so you can get an idea of what the coin on average sells for. http://listado.mercadolibre.com.mx/un-centavo-1890-mo.-republica-mexicana


Is Melting coin being heated and turn black this is used as a test for metal a chemical or a physical change?

The melting of a coin due to heat is a physical change as it alters the physical state of the coin from solid to liquid without changing its chemical composition. The black color that appears is likely due to the formation of an oxide layer on the surface of the coin, also a physical change.


How much is a 1890 dollar coin?

7-24-11>>> Assuming the coin is circulated and has no mintmarks, retail value is $38.00-$41.00 depending on how much wear the coin shows. The 1890 Morgan is a common date.


Value of 1890 silver coin?

Need to know the country and face value of the coin - and condition.


What is the value of an 1890 US silver dollar with no mint mark?

Assuming the coin is circulated and still in collectible condition, the 1890 Morgan is a common coin, current average values are $38.00-$44.00 depending on the grade of the coin.


What does the letter V mean on a silver 1890 coin?

Anonymous


Who is on the 1890 us dime coin?

A seated Lady Liberty.


Who appears on the 1890 dollar coin?

It's an image of Liberty.


What is a 1890 silver dollar value?

Assuming the coin is circulated and has no mintmarks, retail value is $23.00-$31.00 depending on how much wear the coin shows. The 1890 Morgan is a common date.


What can be the value of a 1890 Silver dollar?

Assuming the coin is circulated and has no mintmarks, retail value is $23.00-$31.00 depending on how much wear the coin shows. The 1890 Morgan is a common date.