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Thank you for the welcome ! Quite surprised that my skinny blog is getting read at all, truth be told A.

It might work to compare pigments, but it is not a trifle - Stefanos Karampelas of Gubelin has a handful of papers on pearl pigments, those would give you a measure of the task. Still easier than controlled culture of such things, methinks. I will be writing of the other, larger, light...