Fluorescein
synthetic organic compound used as dye and fluorescent tracer From Wikipedia, the free encyclopedia
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Fluorescein is an organic compound and dye. It is based on xanthene and belongs to triarylmethine dye family.

It is available as a dark orange/red powder and used in water and alcohol. It is widely used as a fluorescent tracer. The color of its solutions is green by reflection and orange by transmission.[1]
References
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