jasperj316 Posted January 29, 2019 Report Share Posted January 29, 2019 found these 4 marbles that have an orange glow under the glaze when submitted to UV black light can anyone help identify? Link to comment Share on other sites More sharing options...
Steph Posted January 29, 2019 Report Share Posted January 29, 2019 They look like clay. I don't think the fluorescence means much. Maybe something about what chemicals might have been used in the coloring. Link to comment Share on other sites More sharing options...
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