Fluorescein, 99%, pure, laser grade 410620010 from Thermo Fisher Scientific

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(1) Evaluating changes to Ralstonia pickettii in high-purity water to guide selection of potential calibration materials for online water bioburden analyzersJournal of Industrial Microbiology and BiotechnologyNovember 1, 2019Kurt D. Benkstein, Sandra M. Da Silva, Nancy J. Lin, Dean C. Ripplemolecules of fluorescein in solution. Fluorescein was acquired from Acros Organics (catalog number 410620010) [4], and diluted gravimetrically in borate buffer solution (pH ≈ 9.2 to 9.3) for fluorescence tests

Fluorescein, 99%, pure, laser grade from Thermo Fisher Scientific