New: 18kAll contenthive-129948hive-196917krhive-180932steemzzanhive-150122hive-185836hive-183959photographyhive-188619hive-144064hive-183397hive-166405hive-101145uncommonlabhive-103599hive-184714hive-145157hive-139150hive-165987hive-150943hive-109690hive-193637hive-139765TrendingNewHotLikersjohnnie (41)in silver • 8 years agoA black stuff reminds me of an experiment 25 years beforeGuess what this stuff is. It is silver blackened gradually by trace sulphur content in air. I got it from customer somewhat 25 years ago. Then a test was undergone to see whether a ratio of…
