Actually it can. It is producing some sort of "hallo" or simillar...right now i can not explain what it is. But...benefits from that "hallo" effect or whatever, are not great..at least not so great to allow you to detect coin at 10 times or more distance than without it.
I already posted some of my experiences...somewhere on this forum.
Let me repeat one example;
once i detected and dug iron arrow from 30-35cm (if i remember good) in the ground. Soil was wet so there was some mud on arrow. I rubed it with fingers and removed mud. It was dry in a minute and almost clean from mud. Than i checked it in air...to detect. Detector bairly detected it at 20cm distance in air??? So...again i checked hole and arround it, to see if there is some other metal. No...nothing.
This i experienced also many times later on the fields. With various items and various types of metal. Longer the period, metal was in soil - better detection and more stronger hallo effect.
But... usually i do collect old roman coins, 1500-2000 years being in the ground. Enough to produce strong hallo effect? Yes, i think more than enough.So...all the benefits from it, i've seen so far were 3-5cm more in ground for single coin. Larger items also...
Hoard....recently burried could be detected at 40-50cm with so so detector (depends of hoard quantity and area that it poops, but let's take 50 coins hoard as an example). But hoard (same one) which is 1500 years in the ground can successfully be detected at 60-80 cm.....but not 2m...3m..20m...or 100m !!!! Not possiblle!
So...you see; there are some benefits from hallo effect.....but not that great.
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