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Wednesday, June 4th, 2025
the Seventh Week after Easter
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Bible Dictionaries
Fluorescein

Webster's Dictionary

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(n.) A yellowish red, crystalline substance, C20H12O5, produced by heating together phthalic anhydride and resorcin; - so called, from the very brilliant yellowish green fluorescence of its alkaline solutions. It has acid properties, and its salts of the alkalies are known to the trade under the name of uranin.

Bibliography Information
Webster, Noah. Entry for 'Fluorescein'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​f/fluorescein.html. 1828.
 
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