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Fluorescent dyes are the most successful water tracers ever developed. Fluorescein
(a green fluorescent dye) was first created in 1871. Six years later, in 1877, it
was used to trace the sinking portions of the upper Danube river. A few years later
a more water-soluble, disodium salt form of the dye was introduced under the trade
name "Uranine". Today there many fluorescent dyes, but only about 10 of them are
considered safe enough to use for dye tracing. Over one hundred and twenty years
later, Uranine is still one of the best fluorescent dyes available for water tracing.
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