This is one of those cases where VDI numbers and not just icons can come in handy.
Regarding one specific target that comes in at zinc and you don't want to miss here are the 5 I have found so far in my career.
All came in as zinc as a few have already stated but where they come in at zinc is the key to finding these in a sea of zincolns.
On my Fishers the zinc area goes from about 48-64 or so.
Actual zinc cent numbers not counting any funny stuff like masking trash are usually in the 61-63 area on the two Fisher units I have hunted with, an F2 and an F70.
These 10K Class rings vary wildly in weight from about 8 grams up to 18 but they all came in at a specific range on both detectors...from 48-52 on the VDI numbers.
To this day if I see that range of numbers on my F70 screen over a solid great sounding target I get real excited, most times it is not another gold class ring but you never know.
I can easily hunt in areas with tons of zinc cents and ignore them in favor of digging those lower zinc number hoping for lightning to hit one more time.
Of course the disadvantage is there is a lot of can slaw down there at the lower zinc area and there are plenty of good things that come in at the zinc cent range like Indian head cents and some civil war bullets.
Still, like with most things in life the more information you have at hand the easier some decisions you need to make can be...in this case digging decisions.
Now just to screw with your head here is a target that I dug years ago with an F2 that sure messed with mine and made me very glad I was digging all zincoln cent signals at the time.
This was a solid 61, if you wanted me to bet my car this was going to be a zinc cent I probably would have done just that.
What popped up instead shocked me and then thrilled me. ..a very thick and heavy man's silver bracelet.
You see silver coins and other things usually come in high but silver chains...not so much.
I have found many way lower than this all the way down to foil and even into iron but this one was a honking heavy one that attempted to disguise itself as a common, lowly zincoln.
Because it did I am sure it was passed over by plenty of other hunters in this public park because they decided skipping this dead on zinc cent signal was a smart move.
The universe is a harsh mistress to us dirt diggers.