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Originally Posted by J_Player
Final note: You can create a coin with a halo by taking a copper coin and burying it in a container of soil to which you add just enough ocean water to keep it damp. Put a cover on the container and let it sit for a few weeks. I have an up-comming "mayonnaise jar test" for coin halos which will begin in a few weeks, involving lots of mayonnaise jars and coins. I exect it will take several months for any halo to develop, if it does at all. If you have any test suggestions, let me know in the next few weeks.
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I suggest filling 3 jars with wet beach sand straight from the surf. Near the top of one jar, place a zinc penny that has several deep surface scratches to expose the zinc. Near the surface of a second jar, place a copper penny. Leave the 3rd jar with no coin. Turn them upside down so the pennys are now at the bottom. Let them sit for a month or two. When it's time to test, place a fresh penny in the 3rd jar to compare with.
- Carl