xanthene dye

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xan′thene dye′

any of a group of dyes having a molecular structure related to that of xanthene and in which the aromatic (C6H4) groups are the chromophore.
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Rhodamine B is a xanthene dye whose optical properties depend of several factors, such as solvent, concentration and pH value [2].
Rose Bengal is a red, xanthene dye (including other members like phloxine b, erythrosine, and eosin yellow) that produces reactive, singlet oxygen when exposed to light.
These include naturally occurring molecules such as chiorophylls, porphyrins, phthalocyanines, flavins, thiazine dyes, acridine dyes, anthraquinone dyes, xanthene dyes, hypercin, tetracyclines, sulfanilamides, psoralens, nalidixic acid, coal tar derivatives, chlorpromazines and aminobenzoic acid derivatives, to name but a few.