New: 18kAll contenthive-129948hive-196917krhive-185836zzanhive-183959steemphotographyhive-180932hive-150122hive-101145hive-183397hive-144064uncommonlabhive-166405hive-184714hive-188619bitcoinkrsuccesshive-103599hive-193637hive-193186hive-179660hive-145157hive-180301TrendingNewHotLikersjohnnie (41)in silver • 7 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…
