coin cleaning

My wife found this while snorkeling. We can't quite make out the coin, and I realize these pictures don't help much, but truthfully there isn't much more to see. What i'm wondering is, how long does it take for this to happen to a coin? It's probably copper or iron for it to turn itself...

Flashback 2003 - the next time you dig an unidentified coin be very careful cleaning it! This is a story of caution for newbees or anyone who has never thought about what they just dug from the ground. It was a nice day on Oct. 19, 2003. I decided to go to my silver field where some of my first...

I am just starting out with detecting. I have been doing some reading about my area, but does anyone who is familiar with the California central coast have any suggestions on more specific locations for me? I went to a local beach the other day. Mostly bottle caps which I took home and...

Today was my second day I've gone out since I've had my detector and boy is it a lot of work. I hit a modern park playground just to do some more practicing and it was only about a 25ft in diameter area. This detector picks up a piece of foil 1/8 of an inch size! So I had to change it to...