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Originally Posted by aft_72005
What causes this halo for non-ferrous metals?
Hi J_PLAYER
Also I don’t know , but I am sure 100% , there are something around long buried
Metals .I called it “energy filed “ I experience more than 6 times with LRL . 
Then all , recheck with metal detector . yes , I founded all rusty nails !!!!!!!! 
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Hi Aft,
I have found many rusty nails. Usually they give the same signal as new nails, but sometimes they give a bigger signal than a new nail. I have seen signals maybe less than twice as much as I expect for a nail. When I dig these big signal rusty nails, I see they are very rusted to the point where the oxidation has penetrated into the metal and made the nail weak. I often see the rust layer is partially separated from the nail in the center, and is being absorbed into the adjacent soil. This makes me think some significant percentage of the iron has been converted to iron oxide and even combined with other soil constituents. Yet there is pure iron or steel at the core of the nail remaining. I did not see any evidence of an extra energy field from these rusty nails, but I did see a larger conductive area that could produce more eddy currents than is found in a fresh nail. My tests with chunks of rust that were broken off large nails showed they do make signals on my metal detectors.
So I am thinking I have not seen any energy field from rusty nails when using metal detectors except for extra eddy currents that a fresh nail will not show.
But one thing I am certain.... rusty nails are not a happy treasure to find unless they are nailed into a treasure chest.
Best wishes,
J_P