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halo effect

vx3 man

New member
Was hunting this afternoon,was getting nice quarter signals 2.5 was dominant pinpointed like a coin turns out they were hand pounded rusty nails,about 8 inches down dug about 5 of them and they all sounded good,any tips to avoid this? Or can someone explain halo,fro what I get its when the target starts to breakdown and the soil is soaking up the minerals from said target,which makes it read higher
 
Halo effect is when a metal target starts to deteriorate and it leaches out away from the target and is in the ground around the target. If you dig a coin, if you look close, sometimes you may see a dark area around where the coin is depending on your dirt. As far as nails, lots of people get fooled by them. Iron will wrap around into the high 80s and 90s.
My method is to accept the negative numbers and assign a 5 tone to them. When I get a target like that, I can hear the ticking sound around it. You have to pinpoint exactly on the target and then just barely wiggle your coil side to side (less than 2 inches) and if it just has a ticking noise,...it's iron.
Just my way and it works great for me!
 
To help ID nails, try turning 90 degrees and listen to the target again, often the iron nail will not respond as well and the pinpoint will often be off to the side of where you got the good target ID. Eddy currents likes to mass off of the pointed end of a nail or piece of wire.

Halos and iron is pretty easy to understand when the iron rusts, (iron oxide) and creates a larger electrical target. Silver and gold halos are a little more complicated because the metals are more noble and it is not the target that is changing but the minerals in the ground surrounding the target are changing to oxides through galvanic action of the two dissimilar metals in a moist environment. That is the dark soil around a coin that has had a perfect environment to create a natural battery over a long period of time.

Not everyone experiences silver and gold halos because they do not have what is necessary to create them, mineralization, moisture and time in the ground.
 
A quarter will show a dominant frequency of 2.5 KHz but iron will usually show 22.5 KHz as the dominant frequency. Iron is also hard to pinpoint...it seems to move around, while good targets will be consistent. Keep in mind that on deep targets (more than 7 or 8 inches) all bets are off! Digging is the only way you can be sure.
 
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