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, it turns iridescent deep purple or blue. After a period of time, it turns dark black. The streak.....more
the luster of the crystals and the black color may turn into silver white over time if exposed to sun.....more
streaks.When exposed to light for a long period of time, realgar will deteriorate into brown-yellow.....more
and electricity. At the same time, it is resistant to chemical reaction and tarnish. The luster.....more
