Could anyone advise me on figuring out if an amber bead I have is blue amber or copal?
It passed all the usual amber tests except the bead got tacky enough to stick to my finger from acetone application. Once the acetone fully evaporated, there was no damage left.
However, it has strong blue fluorescence in sunlight, and based on what I read this is possible only with resin from Hymenaea protera tree which is supposed to be at least 15 million years old.
Am I missing any info on the existence of copal that can fluoresce in sunlight just like blue amber?
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