Tarnish is what makes our rings turn dark. Depending on the quality of the silver and the other metals alloyed in with them all come in to play..

Found some things I haven't seen in years... First what is left of my ground dug collection... Weird on how some are in pretty good condition and some in relic condition. These found in the early to mid 1990s... I'd say the amount of sulfur, types of soil and other chemicals on them all come in to play also..

I've never seen anything enamel come up even in good condition. Always missing a piece, cracked etc. Here a nice wartime Soviet Guards badge...