<unk>  is an organic compound and dye. It is available as a dark orange/red powder slightly soluble in water and alcohol. It is widely used as a<unk> t tracer for many applications.<unk>  is a<unk> uorophore commonly used in microscopy, in a type of dye laser as the gain medium, in forensics and serology to detect latent blood stains, and in dye tracing.<unk>  has an absorption maximum at 494 nm and emission maximum of 512 nm (in water). The major derivatives are<unk>  isothiocyanate <unk>  and, in oligonucleotide synthesis, 6-FAM phosphoramidite. The color of its aqueous solution varies from green to orange as a function of the way it is observed: by reflection or by transmission, as can be noticed in bubble levels, for example, in which<unk>  is added as a colorant to the alcohol filling the tube in order to increase the visibility of the air bubble contained within (thus enhancing the precision of the instrument). More concentrated solutions of<unk>  can even appear red. It is on the World Health Organization's List of Essential Medicines.
Fluorescein
Anisodamine
Orellanine
Cyanoacrylate
Coricidin
Phthalate
Diatrizoate
Azo dye