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Hmm. I won't contradict you guys, 'cause I just don't know. But it didn't strike me as a filter. The phoshor surface looked flat purple, and not bright at all like regular P4 phosphor would look behind candy-colored glass. I guess I should have taken a better photo. I had hoped an expert would chime in and describe the chemistry/physics of it. But perhaps there isn't any. It was a curiosity to me. I guess it will remain so...
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