DetectingWales.com

                                        Got to the beach on Sunday morning but only managed twenty-seven pence in decimal and one 1963 threepenny-bit. Having now found a number of threepenny-bits, both on the beach and on my permissions, I was surprised to see how the conditions of the coins vary depending on the location they were found. Beach bits clean up quite well, but those found on my permissions are unbelievably grotty.

well done :)

Thats in good nick..   Mine always come up grotty

                                   Even off the beach, Nobby? All my beach bits come from the high tide line and the verdigris coating starts come off even before I try cleaning them, but those off my permissions are always beyond being rescued by cleaning. The permission bits are always well eaten into by the heavy soils.

I think the same would be true to a certain extent on most copper based metals, they don't make ships nails from copper for nothing as it's semi inert to salt corrosion but there are all manor of chemicals in soils both natural and man made and with these being brass possibly the zinc in them makes them more vulnerable ;)

Hi Geoff,
               strangely, my pre-decimal coins ( pennies ) seem to fare better in-land than they do on the beach, but the maritime nails that I find look almost as good as the day they were driven into the wood. Not as shiny though!  ;)

I have found that coin conditions do vary also,but one of my theories is that,land that has had a lot of cows/sheep on it for years has a very high acid content (pH readings taken)probably caused by excess "wee &poo"
Always wear your gloves folks!!!..........yes of course you do....LOL😁!!!

The high nitrogen fertilisers of the last century were a big destroyer of finds.....horse wee is vvvvvvery corrosive :-\

Oh POO!,  three of my permissions are horse establishments.  :(