Florescent and Fluorescent

The first means to be in flower (think “flor,” Spanish for flower). The second means to give off light of a greater wavelength when illuminated. Fluorspar, a mineral containing fluorine, gives off a bluish tinge when illuminated. Do not confuse this with phosphorescence which means to shine in the dark. Note the spelling of fluorescence. It is not flourescence which might be a description of the way your counter, apron, and the nearby floor look after you have kneaded bread.

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