Trying to determine the best method for cleaning the coins. Thinking soak in warm water and dawn, then a soft toothbrush.
So I would have no way of telling what type of soil you have, and my guess is that you're in Europe. Regardless, they look like they'll clean up OK. For copper coins I find here in Mass, I boil Hydrogen Peroxide, drop a few Indians or other copper/bronze coins in it for about a 5 minute bath on each side, then I'll take out one, dry it, put just a little olive oil on a toothpick and give it a light scraping. The dirt typically comes off very easily. Once I get the majority of the dirt off, I'll check it under a loupe and if there's anything left, unless the coin is totally beat, I'll use a q-tip again dipped in a little olive oil to finish those areas. This method has served me pretty well through many years. I just did a few yesterday- PM me if you want to see some pics.
Well done on the hunt.
I got the Italian coin clean enough to see the date, 1924. The hammered coins will need to soak but I don't think I will get any details.
Great 2 hour hunt.
One of the what I thought was hammered is not, it's a minted 1700 Carlos II 1 grano. Ended up using baking soda to remove enough to identify it. Pretty sure the other is the same but it is smooth
Both sides with visible details.
