Originally posted by MonsieurM
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A metal detector will strongly sense a piece of rusty iron but
a new coin or a fresh shiny steel does not react nearly as much with the sensing coils.
Rusty bottle caps are commonly mistaken for buried treasures.
In the case of a silver coin buried 40 years it is the same. Many metal detector enthusiast wonder why a new coin set in the ground has such a weak field.
There is another idea that the silver coins give off ions that travel outward and cause the clay to have a magnetic aura. These circles are referred to as halos.
In antenna ground systems there is much improvement when the radius around the ground rod becomes conductive. By mixing one pound of Epsom with one gallon of water and applying this around the copper ground rod the radius of conductive path is enlarged.
I believe that a silver coin buried 40 years can reacted with a small amount of H2S in the soil. The silver coin in relationship to the ground is the high concentration area of silver ions with water and the earth is the low concentration.
This gradient makes the potential difference that allows the self charging effect we find in some metals having oxide layer.
The silver coin showing the least corrosion may have occurred because the soil had just enough iron pyrite (sulfur) so that after a good rain or two the coin was sufficiently coated with the black oxide. Some of these coins are remarkably clean for being in the ground for so long. Also noted that the radius around the coin are effected with only minute amount of silver ions and small amount of water.
Thankyou, that is a different way of looking at the crystal cells that may help in our understanding.
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