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Dye tracing is tracking and tracing various flows using dye added to the liquid in question. The purpose of tracking may be an analysis of the flow itself, of the transport of something by the flow of the objects that convey the flow. It is an evolution of the ages-known float tracing method, which basically consists of throwing a buoyant object into a waterflow to see where it goes or where it emerges.. Dye tracking may be either qualitative, i.e., the presence of particular flow and its estimate, or quantitative, when the amount of the traced dye is measured by special instruments. ==Fluorescent dyes== Often fluorescent dyes are used for this purpose, especially in the following circumstances *Insufficient lighting (e.g., sewers or cave waters) *Precise quantitative data are required, measured by a fluorometer *Very small amounts of the dye is allowed to be added (1 part per trillion may be detected). Fluorescein is among the first fluorescent dyes, developed in 1871. Its disodium salt under the trademark "Uranine" was developed several years later and still remains among the best tracer dyes.〔(An educational website about karst and dye tracing ), by Crawford Hydrology Laboratory / Center for Cave and Karst Study in association with Western Kentucky University〕 Other popular tracer dyes are rhodamine, pyranine and sulforhodamine. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「dye tracing」の詳細全文を読む スポンサード リンク
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