bottle cap hell

[kydigger]

I went out for a little while this evening to a park on the Ohio river in northern Kentucky that was the sight of a swimming beach when people actuall swam in the Ohio River.
Time and time again, my F4 read CU / dime with a reading of 75 to 80. I dug one copper, one zink (F4 said it was a zink). and about a dozen bottlecaps. This is the first time my my F4 read bottle caps as copper/ dime so consistantly. In the short time I've had it, the Cu / dime reading has usually been a dime until today. Anybody have any suggestions? Or, was it just one of "those days".

 

[Cal_Cobra]

I take it this was with the 11" DD? If so, switch to either the 8" or 10" concentric and problem solved, bottle caps should ID correctly.

 

[Monte]

"crown cap", crimp-edged BOTTLE CAP, or the taller, higher-conductive aluminum SCREW CAP? Quite often I will see the term BOTTLE CAP used to reference the SCREW CAP. Yes, they come off bottles but for detecting purposes we classify them differently.

As Cal Cobra mentioned, the coil choice might be a factor, but sometimes it is just an issue due to how certain detectors operate, combined with the coil in use, operator coil tactics, ground environment and such.

Monte

 

[bthom]

I have had alot of experience with bottle caps, you soon learn that different manufacturers caps come up different ids... I can tell a corona cap from another brand. You will find that where you have one that reads the same as a targeted coin most of the time it will read slightly different if you read from the edge of the coil. Coins are pretty solid all over the coil, caps go off faster around the edges.. this is my experience anyway.. and not foolproof.. I have found that some coins that are starting to corrode behave slightly different to nice new shiny ones.. I look for sort of "patterns" of the solid number I'm after.... really its all about putting in time and Learning you machine.. believe me when you do you realize how great these modern detectors are.