I agree with Amanda- treatments eroding is the probable cause there...
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Could it be that it has reddish fluorescence (Mexican trademark - according to some G&G article etc.) instead? If there's a black light in the house, it should be easy to check, and cool if it turns up so, I would imagine
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That's an excellent suggestion and one that I will experiment with this week! I would also not be thrilled to see very thin nacre layers be the culprit here but it is all too easy to imagine... However it turns out I will be sure let you know!