Fluorescein

synthetic organic compound used as dye and fluorescent tracer

Fluorescein is an organic compound and dye. It is based on xanthene and belongs to triarylmethine dye family.

Fluorescein under UV illumination

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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  1. Sjöback, Robert; Nygren, Jan; Kubista, Mikael (1995-06-01). "Absorption and fluorescence properties of fluorescein". Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 51 (6): L7–L21. Bibcode:1995AcSpA..51L...7S. doi:10.1016/0584-8539(95)01421-P. ISSN 1386-1425.