We supply fluorescein C.I.45350 water soluble bright yellow fluorescent dye powder used for marking and tracing. This dye is the soluble sodium salt form of the dye, and also known as D. & C. Yellow No. 8 and uranine.

We supply fluorescein C.I.45350 water soluble acid yellow 73 non hazardous dye powder for other uses, such as colouration of formulations and recipes. This orange-red powder dissolves in water to produces a very strong fluorescent yellow-green colour when exposed to ultra violet light.

There is a convenient 40% water based liquid version that we also supply, and solvent soluble Solvent Yellow 94 or C.I.45350.1.

Background Information

It is a dye also used by the medical profession for tracing and diagnositic purposes with important uses in opthalmology. We sell the industrial grade, not the medical grade of dye.

https://www.ncbi.nlm.nih.gov/books/NBK555957/

It is a dye with a long history:

Von Baeyer, the German chemist first synthesized it in 1871 from phthalic anhydride and resorcinol and called it resorcinphthalein.

https://www.acs.org/molecule-of-the-week/archive/f/fluorescein.html

Fluorescer, Tracer, Marker, Leak Detection

5Kg, 20Kg Gramme Quantities for Scientists

Keg, Bottle, Vial.

Prompt

UK (+ delivery + VAT) 5kg £48.00/kg. Ask us for prices in different quantities and € and $US prices.

Lambda Max. Absorption 494nm, Lambda Max. Fluorescence 512nm. (Wikipedia). This is pH Dependent.

C.I.45350