Jjay Posted April 15, 2017 Report Share Posted April 15, 2017 I have found that many of my marbles glow different colors when subjected to a black light. I understand the bright green. I was wondering what causes some to glow orange, red and purple? Thanks for your input. I appreciate it. Link to comment Share on other sites More sharing options...
Steph Posted April 15, 2017 Report Share Posted April 15, 2017 Orange and red can come from manganese. Blue can come from calcium. Not sure about purple. Link to comment Share on other sites More sharing options...
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