New: 18kAll contenthive-129948hive-196917krhive-166405hive-180932steemhive-150122zzanhive-183959photographyhive-185836hive-144064hive-145157hive-183397hive-101145hive-188619uncommonlabhive-103599hive-184714hive-139150hive-109690hive-193637hive-179660hive-113376hive-180106TrendingNewHotLikersjohnnie (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…
