Not only does dirt stick to coins,it takes a long and tedious method/s to clean them properly.Silver coins would be noticed in a pile fairly easily though I'd imagine as they would not accumilate as much as bronze.For $25 you can get nice silver roman coins in nice shape or minty bronze ones,if you look alot and have patience.If you look for uncleaned coins,first research cleaning coins-huge pain unless you are into it.I use the boil,then mineral water soaking method,followed by hand/tool cleaning with magnification,then sealing with museum wax-takes WEEKS of work & time for the majority of them,although I have a great selection of great condition late romans( which is what you'll be buying mostly )(.When looking for uncleaned coins,look for people in Eastern Europe who dig them up.Good Luck:)



















