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That property which some transparent bodies have of producing at their surface, or within their substance, light different in color from the mass of the material, as when green crystals of fluor spar afford blue reflections. It is due not to the difference in the color of a distinct surface layer, but to the power whic…

to napthalene and anthracene. It is a white crystalline substance, C18H12, of strong blue fluorescence, but generally colored yellow by impurities.

curcuma root, extracted as an orange yellow crystalline substance, C14H14O4, with a green fluorescence.

Producing, or relating to, epipolism or fluorescence. [R.]

See Fluorescence. [R.] Sir J. Herschel.

Changed to the epipolic condition, or that in which the phenomenon of fluorescence is presented; produced by fluorescence; as, epipolized light. [R.] Stokes.

A colorless, crystalline hydrocarbon, C13H10 having a beautiful violet fluorescence; whence its name. It occurs in the higher boiling products of coal tar, and is obtained artificially.

er 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.

Having the property of fluorescence.

An instrument for observing or exhibiting fluorescence.

(Fraxinus) and along with esculin in the bark of the horse-chestnut. It shows a delicate fluorescence in alkaline solutions; -- called also paviin.

n, C14H10, found in coal tar, and obtained as a white crystalline substance with a bluish fluorescence.

variety of colors, as certain solutions derived from vegetables, which display colors by fluorescence.

drocarbon obtained from coal-tar residues, and remarkable for its intense yellowish green fluorescence.

ish red substance, which is used as a dye; -- so called from the peculiar yellowish green fluorescence (resembling that of uranium glass) of its solutions. See Fluorescein.

used to impart to glass a delicate greenish-yellow tint which is accompanied by a strong fluorescence, and its black oxide is used as a pigment in porcelain painting. Symbol U. Atomic weight 239.

powder; -- so called because it forms yellow salts, and because its solution forms a blue fluorescence like quinine.